How do you create a new AVAsset video that consists of only frames from given `CMTimeRange`s of another video?

Apple's sample code Identifying Trajectories in Video contains the following delegate callback:

func cameraViewController(_ controller: CameraViewController, didReceiveBuffer buffer: CMSampleBuffer, orientation: CGImagePropertyOrientation) {
    let visionHandler = VNImageRequestHandler(cmSampleBuffer: buffer, orientation: orientation, options: [:])
    
    if gameManager.stateMachine.currentState is GameManager.TrackThrowsState {
        DispatchQueue.main.async {
            // Get the frame of rendered view
            let normalizedFrame = CGRect(x: 0, y: 0, width: 1, height: 1)
            self.jointSegmentView.frame = controller.viewRectForVisionRect(normalizedFrame)
            self.trajectoryView.frame = controller.viewRectForVisionRect(normalizedFrame)
        }
        // Perform the trajectory request in a separate dispatch queue.
        trajectoryQueue.async {
            do {
                try visionHandler.perform([self.detectTrajectoryRequest])
                if let results = self.detectTrajectoryRequest.results {
                    DispatchQueue.main.async {
                        self.processTrajectoryObservations(controller, results)
                    }
                }
            } catch {
                AppError.display(error, inViewController: self)
            }
        }
    } 
}

However, instead of drawing UI whenever detectTrajectoryRequest.results exist (https://developer.apple.com/documentation/vision/vndetecttrajectoriesrequest/3675672-results), I'm interested in using the CMTimeRange provided by each result to construct a new video. In effect, this would filter down the original video to only frames with trajectories. How might I accomplish this, perhaps through writing only specific time ranges' frames from one AVFoundation video to a new AVFoundation video?