CGImageFromSampleBuffer.swift

func cgImageFromSampleBuffer(sampleBuffer: CMSampleBuffer) -> CGImage {
    
    let pixelBuffer : CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer)!
    let ciImage = CIImage(CVPixelBuffer: pixelBuffer)
    let context: CIContext = CIContext(options: nil)
    let rect = CGRectMake(0, 0, CGFloat(CVPixelBufferGetWidth(pixelBuffer)), CGFloat(CVPixelBufferGetHeight(pixelBuffer)))
    let cgImage = context.createCGImage(ciImage, fromRect: rect)
    
    return cgImage
  }