Create a Metal Texture from the Pixel Buffer
Start by instantiating a Metal texture cache as follows:
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cvret = CVMetalTextureCacheCreate(
kCFAllocatorDefault,
nil,
_metalDevice,
nil,
&_CVMTLTextureCache);
Then, create a CVPixelBuffer-backed Metal texture image from the texture cache:
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cvret = CVMetalTextureCacheCreateTextureFromImage(
kCFAllocatorDefault,
_CVMTLTextureCache,
_CVPixelBuffer, nil,
_formatInfo->mtlFormat,
_size.width, _size.height,
0,
&_CVMTLTexture);