This function reads a video and exposes it's pixel buffers.

readImageBuffer.swift

func readImageBuffer(fromVideo videoURL: URL) {
        let asset = AVAsset(url: videoURL)
        let assetTrack = asset.tracks.first!
        let assetReader = try! AVAssetReader(asset: asset)
        
        let outputSettings: [String: Any] = [
            String(kCVPixelBufferPixelFormatTypeKey): kCVPixelFormatType_32BGRA,
            String(kCVPixelBufferWidthKey): 513,
            String(kCVPixelBufferHeightKey): 513,
        ]
        let assetReaderTrack = AVAssetReaderTrackOutput(track: assetTrack, outputSettings: outputSettings)
        
        assetReader.add(assetReaderTrack)
        assetReader.startReading()
 
        
        while let sampleBuffer = assetReaderTrack.copyNextSampleBuffer() {
            guard let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else {
                print("failed ❌")
                continue
            }
            //handle pixel buffer
                
        }
    }