Remove bridge cast when CVEAGLContext is defined to be a EAGLContext.

Fix incorrect YUV to RGB color matrix coefficients. Request for kCVPixelFormatType_420YpCbCr8BiPlanarFullRange rather than kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange YUV buffers.

Illustrates how to capture YUV camera frames and process them using OpenGL ES 2.0.