如何在iOS中为摄像头创建自定义覆盖？

import AVFoundation

let captureSession = AVCaptureSession()
let videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)

// 设置预览层的frame和视频填充模式
videoPreviewLayer.frame = view.bounds
videoPreviewLayer.videoGravity = .resizeAspectFill

// 将预览层添加到视图层级中
view.layer.addSublayer(videoPreviewLayer)

guard let captureDevice = AVCaptureDevice.default(for: .video) else { return }

do {
    let input = try AVCaptureDeviceInput(device: captureDevice)
    captureSession.addInput(input)
} catch {
    print(error.localizedDescription)
}

let videoOutput = AVCaptureVideoDataOutput()
videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue.global(qos: .default))
captureSession.addOutput(videoOutput)

extension ViewController: AVCaptureVideoDataOutputSampleBufferDelegate {
    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        // 在这里处理视频帧数据
    }
}

let overlayView = UIView(frame: view.bounds)
overlayView.backgroundColor = UIColor.clear

// 添加自定义视图到overlayView上
overlayView.addSubview(yourCustomView)

// 将overlayView添加到视图层级中
view.addSubview(overlayView)