CIImage to CVPixelBuffer

1. Make CVPixel Buffer.

var pixelBuffer: CVPixelBuffer?
let attrs = [kCVPixelBufferCGImageCompatibilityKey: kCFBooleanTrue,
             kCVPixelBufferCGBitmapContextCompatibilityKey: kCFBooleanTrue] as CFDictionary
let width:Int = Int(size.width)
let height:Int = Int(size.height)
CVPixelBufferCreate(kCFAllocatorDefault,
                    width,
                    height,
                    kCVPixelFormatType_32BGRA,
                    attrs,
                    &pixelBuffer)

2, Render CIImage to CVPixelBuffer.

let context = CIContext()
context.render(ciImage, to: pixelBuffer!)

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