Black screen on showing camera frames

[diegomeire]

the method CVMetalTextureCacheCreateTextureFromImage was generating the error -6661 for every frame because it was expecting the _capturedImageTextureCache variable to be CVMetalTextureCacheRef rather than CVOpenGLESTextureCacheRef.

This change provides the correction to make the camera work again.

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[judax]

Thank you for sending a PR. I think this PR is not finished or correct, right?

[judax]

I guess that this is not the change you were intending to submit. Am I right?

[diegomeire]

Not really. That's weird. The lines 66 and 518 were changed.
Maybe it's because I tried one PR before but had to undo it.