Add pipeline visualization example.

This example demonstrates real-time visualization of data from
Holoscan applications using NATS messaging and web-based dashboards.
It showcases how to stream tensor data from a Holoscan pipeline
and visualize it dynamically in a browser.

Signed-off-by: Andreas Heumann <[email protected]>

Author: AndreasHeumann

.vscode/launch.json

@@ -1262,6 +1262,45 @@
         },
         //#endregion nvidia_nim_nvclip
 
+        //#region pipeline_visualization
+        {
+            "name": "(gdb) pipeline_visualization/cpp",
+            "type": "cppdbg",
+            "request": "launch",
+            "preLaunchTask": "Build pipeline_visualization",
+            "program": "${workspaceFolder}/build/pipeline_visualization/applications/pipeline_visualization/cpp/pipeline_visualization",
+            "args": [ ],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}/applications/pipeline_visualization/",
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ],
+            "presentation": {
+                "group": "pipeline_visualization",
+            }
+        },
+        {
+            "name": "(debugpy) pipeline_visualization/python",
+            "type": "debugpy",
+            "request": "launch",
+            "preLaunchTask": "Build pipeline_visualization",
+            "program": "${workspaceFolder}/applications/pipeline_visualization/python/pipeline_visualization.py",
+            "cwd": "${workspaceFolder}/build/pipeline_visualization/",
+            "env": {
+                "PYTHONPATH": "${workspaceFolder}/build/pipeline_visualization/python/lib:${workspaceFolder}:${env:PYTHONPATH}"
+            },
+            "presentation": {
+                "group": "pipeline_visualization",
+            }
+        },
+        //#endregion pipeline_visualization
+
         //#region slang
         {
             "name": "(gdb) slang_simple/cpp",

.vscode/tasks.json

@@ -515,6 +515,26 @@
             "problemMatcher": [],
             "detail": "CMake template build task"
         },
+        {
+            "type": "shell",
+            "label": "Build pipeline_visualization",
+            "command": "./holohub",
+            "args": [
+                "build",
+                "pipeline_visualization",
+                "--build-type",
+                "debug",
+                "--local",
+                "--language",
+                "python"
+            ],
+            "options": {
+                "cwd": "${env:WORKSPACE_DIR}"
+            },
+            "group": "build",
+            "problemMatcher": [],
+            "detail": "CMake template build task"
+        },
         {
             "type": "shell",
             "label": "Build slang_simple",

applications/CMakeLists.txt

@@ -92,6 +92,8 @@ add_holohub_application(object_detection_torch DEPENDS
 
 add_holohub_application(openigtlink_3dslicer DEPENDS OPERATORS openigtlink)
 
+add_holohub_application(pipeline_visualization)
+
 add_holohub_application(polyp_detection)
 
 add_holohub_application(pva_video_filter)

applications/pipeline_visualization/CMakeLists.txt

@@ -0,0 +1,83 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 3.20)
+
+include(FetchContent)
+
+cmake_minimum_required(VERSION 3.20)
+
+find_package(holoscan 3.8.0 REQUIRED CONFIG
+             PATHS "/opt/nvidia/holoscan" "/workspace/holoscan-sdk/install")
+
+FetchContent_Declare(
+  flatbuffers
+  GIT_REPOSITORY https://github.com/google/flatbuffers.git
+  GIT_TAG v25.9.23
+  CMAKE_ARGS
+    -DFLATBUFFERS_BUILD_TESTS=OFF
+    -DFLATBUFFERS_BUILD_FLATHASH=OFF
+    -DFLATBUFFERS_BUILD_FLATC=ON
+    -DFLATBUFFERS_BUILD_FLATLIB=ON
+    -DFLATBUFFERS_STATIC_FLATC=ON
+    -DFLATBUFFERS_STRICT_MODE=ON
+)
+FetchContent_MakeAvailable(flatbuffers)
+list(APPEND CMAKE_MODULE_PATH "${flatbuffers_SOURCE_DIR}/CMake")
+
+include(BuildFlatBuffers)
+
+set(FB_SCHEMA_FILES
+    "${CMAKE_CURRENT_SOURCE_DIR}/schemas/message.fbs"
+    "${CMAKE_CURRENT_SOURCE_DIR}/schemas/tensor.fbs"
+    )
+
+# Build for cpp and python
+set(FLATBUFFERS_FLATC_SCHEMA_EXTRA_ARGS
+    --cpp
+    --python
+    --bfbs-gen-embed
+    --cpp-ptr-type std::shared_ptr
+    --gen-object-api
+    --reflect-names
+    --reflect-types
+    --schema
+    )
+
+build_flatbuffers(
+    "${FB_SCHEMA_FILES}" # flatbuffers_schemas
+    "" # flatbuffers_options
+    "pipeline_visualization_flatbuffers_schemas" # flatbuffers_target_name
+    "" # additional_dependencies
+    "${CMAKE_CURRENT_BINARY_DIR}/flatbuffers" # generated_includes_dir
+    "" # binary_schemas_dir
+    "" # copy_text_schemas_dir
+    )
+
+add_library(pipeline_visualization_flatbuffers_target INTERFACE)
+add_library(pipeline_visualization_flatbuffers::target ALIAS pipeline_visualization_flatbuffers_target)
+target_include_directories(pipeline_visualization_flatbuffers_target
+    INTERFACE
+        ${CMAKE_CURRENT_BINARY_DIR}
+        ${flatbuffers_SOURCE_DIR}/include
+    )
+add_dependencies(pipeline_visualization_flatbuffers_target
+    pipeline_visualization_flatbuffers_schemas
+    )
+
+add_subdirectory(cpp)
+if(HOLOHUB_BUILD_PYTHON)
+    add_subdirectory(python)
+endif()