我们可以使用以下代码示例解决此问题：

在SwiftUI中添加一个自定义视图，用于捕获视频并将其保存到设备的本地文件中。

import SwiftUI
import AVFoundation

struct CameraView: View {
    
    @StateObject var viewModel: CameraViewModel
    
    var body: some View {
        ZStack {
            CameraPreviewView(session: viewModel.session)
            VStack {
                Spacer()
                HStack {
                    RecordButtonView(viewModel: viewModel)
                        .padding()
                    Spacer()
                }
            }
        }
    }
}

class CameraViewModel: NSObject, ObservableObject, AVCaptureFileOutputRecordingDelegate {

    let session: AVCaptureSession
    var videoFileOutput: AVCaptureMovieFileOutput?
    var recording = false
    var videoURL: URL?
    
    init(session: AVCaptureSession) {
        self.session = session
        super.init()
        self.videoFileOutput = AVCaptureMovieFileOutput()
        if self.session.canAddOutput(self.videoFileOutput!) {
            self.session.addOutput(self.videoFileOutput!)
        }
    }
    
    func startRecording() {
        let fileURL = URL(fileURLWithPath: NSTemporaryDirectory() + "output.mov")
        self.videoFileOutput?.startRecording(to: fileURL, recordingDelegate: self)
        self.recording = true
        self.videoURL = fileURL
    }
    
    func stopRecording() {
        self.videoFileOutput?.stopRecording()
        self.recording = false
    }
    
    func fileOutput(_ output: AVCaptureFileOutput,
                    didFinishRecordingTo outputFileURL: URL,
                    from connections: [AVCaptureConnection],
                    error: Error?) {
        if let error = error {
            print(error.localizedDescription)
        } else {
            UISaveVideoAtPathToSavedPhotosAlbum(outputFileURL.path, nil, nil, nil)
        }
    }
}

struct CameraPreviewView: UIViewRepresentable {
    
    let session: AVCaptureSession
    
    func makeUIView(context: Context) -> UIView {
        let view = UIView(frame: .zero)
        
        if let previewLayer = AVCaptureVideoPreviewLayer(session: session) {
            previewLayer.videoGravity = .resizeAspectFill
            previewLayer.connection?.videoOrientation = .portrait
            view