video recording swiftui

In SwiftUI, you can use the `AVCaptureSession` and `AVCaptureVideoPreviewLayer` classes from the AVFoundation framework to record videos. Here's an example of how you can do it:

import SwiftUI
import AV

struct ContentView: View {
    @State private var isRecording = false
    let captureSession = AVCaptureSession()
    let movieOutput = AVCaptureMovieFileOutput()

    var body: some View {
        VStack {
            if !isRecording {
                Button("Record") {
                    startRecording()
                }
            } else {
                Button("Stop") {
                    stopRecording()
                }
            }
        }
        .onAppear {
            setupCamera()
        }
    }

    func setupCamera() {
        let captureDevice = AVCaptureDevice.default(for: .video)

        guard let input = try? AVCaptureDeviceInput(device: captureDevice!) else { return }
        guard captureSession.canAddInput(input) else { return }
        captureSession.addInput(input)

        guard captureSession.canAddOutput(movieOutput) else { return }
        captureSession.sessionPreset = .high
        captureSession.addOutput(movieOutput)

        let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        previewLayer.videoGravity = .resizeAspectFill

        let rootLayer = NSView(frame: NSRect(x: 0, y: 0, width: 300, height: 300))
        rootLayer.wantsLayer = true
        rootLayer.layer?.backgroundColor = NSColor.black.cgColor
        rootLayer.layer?.addSublayer(previewLayer)

        previewLayer.frame = rootLayer.bounds

        let uiView = NSHostingView(rootView: rootLayer)
        uiView.frame = CGRect(x: 0, y: 0, width: 300, height: 300)

        let viewController = NSViewController()
        viewController.view = uiView

        let window = NSWindow(contentViewController: viewController)
        window.makeKeyAndOrderFront(nil)

        captureSession.startRunning()
    }

    func startRecording() {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        let fileUrl = paths[0].appendingPathComponent("output.mov")
        movieOutput.startRecording(to: fileUrl, recordingDelegate: self)
        isRecording = true
    }

    func stopRecording() {
        movieOutput.stopRecording()
        isRecording = false
    }
}

extension ContentView: AVCaptureFileOutputRecordingDelegate {
    func fileOutput(_ output: AVCaptureFileOutput, didStartRecordingTo fileURL: URL, from connections: [AVCaptureConnection]) {
        print("Started recording to \(fileURL)")
    }

    func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
        print("Finished recording to \(outputFileURL)")
    }
}

This example sets up a camera preview using `AVCaptureVideoPreviewLayer` and records a video when the "Record" button is tapped. The recorded video is saved to the document directory with the name "output.mov". The recording can be stopped by tapping the "Stop" button.

Please note that this code is for macOS development using SwiftUI. If you want to record videos in SwiftUI for iOS, you will need to make some modifications.