CVPixelBufferLockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly);
void *baseAddr = CVPixelBufferGetBaseAddress(pixelBuffer);
size_t width = CVPixelBufferGetWidth(pixelBuffer);
size_t height = CVPixelBufferGetHeight(pixelBuffer);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef cgContext = CGBitmapContextCreate(baseAddr, width, height, 8, CVPixelBufferGetBytesPerRow(pixelBuffer), colorSpace, kCGImageAlphaNoneSkipLast);

CGImageRef cgImage = CGBitmapContextCreateImage(cgContext);
CGContextRelease(cgContext);

CGImageRelease(cgImage);

CVPixelBufferUnlockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly);
CVPixelBufferRelease(pixelBuffer);