如何裁剪AVCaptureMovieFileOutput提供的视频？

import AVFoundation

// 配置和启动摄像头捕捉会话
let captureSession = AVCaptureSession()
// 设置输入设备和输出设备...

// 创建AVCaptureMovieFileOutput实例并添加到捕捉会话
let movieOutput = AVCaptureMovieFileOutput()
captureSession.addOutput(movieOutput)

// 开始录制视频
let outputFileURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("output.mov")
movieOutput.startRecording(to: outputFileURL, recordingDelegate: self)

// 停止录制视频
movieOutput.stopRecording()

// 裁剪视频
let asset = AVAsset(url: outputFileURL)
let composition = AVMutableComposition()
let videoTrack = asset.tracks(withMediaType: .video).first!
let audioTrack = asset.tracks(withMediaType: .audio).first!
let compositionVideoTrack = composition.addMutableTrack(withMediaType: .video, preferredTrackID: kCMPersistentTrackID_Invalid)
let compositionAudioTrack = composition.addMutableTrack(withMediaType: .audio, preferredTrackID: kCMPersistentTrackID_Invalid)
try! compositionVideoTrack?.insertTimeRange(CMTimeRange(start: CMTime.zero, duration: CMTime(seconds: 5, preferredTimescale: 600)), of: videoTrack, at: CMTime.zero)
try! compositionAudioTrack?.insertTimeRange(CMTimeRange(start: CMTime.zero, duration: CMTime(seconds: 5, preferredTimescale: 600)), of: audioTrack, at: CMTime.zero)

// 导出裁剪后的视频
let exportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetHighestQuality)
exportSession?.outputFileType = .mov
exportSession?.outputURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("output_trimmed.mov")
exportSession?.exportAsynchronously(completionHandler: {
    // 处理导出完成后的操作
})