swift code for cropVideo (swift 5)

cropvideo

func cropVideo(_ inputFileUrl: URL, outputFileUrl: URL, rect: CGRect, completion: @escaping () -> Void)
    {
        // Get input clip
        //let videoAsset: AVAsset = AVAsset( url: inputFileUrl )
        let videoAsset: AVURLAsset = AVURLAsset(url: inputFileUrl, options: [AVURLAssetPreferPreciseDurationAndTimingKey: true])

        let clipVideoTrack = videoAsset.tracks( withMediaType: AVMediaType.video ).first! as AVAssetTrack

        let videoComposition: AVMutableVideoComposition = AVMutableVideoComposition()
        videoComposition.frameDuration = clipVideoTrack.minFrameDuration
        videoComposition.renderSize = CGSize(width: rect.size.width, height: rect.size.height)

        let instruction: AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
        instruction.timeRange = CMTimeRangeMake(start: CMTime.zero, duration: videoAsset.duration)

        let transformer: AVMutableVideoCompositionLayerInstruction =
        AVMutableVideoCompositionLayerInstruction(assetTrack: clipVideoTrack)

        let t1: CGAffineTransform = CGAffineTransform(translationX: -rect.origin.x, y: -rect.origin.y)
        transformer.setTransform(t1, at: CMTime.zero)

        instruction.layerInstructions = [transformer]
        videoComposition.instructions = [instruction]

        let exporter = AVAssetExportSession(asset: videoAsset, presetName: AVAssetExportPresetHighestQuality)!
        exporter.videoComposition = videoComposition
        exporter.outputFileType = AVFileType.mov
        exporter.outputURL = outputFileUrl
        
        exporter.exportAsynchronously {
            completion()
        }
    }