avfoundation-vision-output-preview-feed.swift

private lazy var previewLayer = AVCaptureVideoPreviewLayer(session: self.captureSession)
private let videoDataOutput = AVCaptureVideoDataOutput()
private func showCameraFeed() {
        self.previewLayer.videoGravity = .resizeAspectFill
        self.view.layer.addSublayer(self.previewLayer)
        self.previewLayer.frame = self.view.frame
    }
    
private func setCameraOutput() {
    self.videoDataOutput.videoSettings = [(kCVPixelBufferPixelFormatTypeKey as NSString) : NSNumber(value: kCVPixelFormatType_32BGRA)] as [String : Any]
self.videoDataOutput.alwaysDiscardsLateVideoFrames = true
    self.videoDataOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "camera_frame_processing_queue"))
self.captureSession.addOutput(self.videoDataOutput)
    guard let connection = self.videoDataOutput.connection(with: AVMediaType.video),
        connection.isVideoOrientationSupported else { return }
connection.videoOrientation = .portrait
}