Play video backwards

What I want is basically reverse an AVAsset and output video file and I found this link - https://github.com/tempire/ReverseAVAsset/blob/master/AVAsset.swift

This is what I did:

import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController {

    var playerViewController = AVPlayerViewController()
    var playerView = AVPlayer()


    override func viewDidAppear(_ animated: Bool) {
         super.viewDidAppear(animated)

         let path = Bundle.main.path(forResource: "video", ofType: "mov")
         let outputUrl = URL(fileURLWithPath: "\(NSUUID().uuidString)video.mov")

         let originalAsset = AVAsset(url: URL(fileURLWithPath: path!))
         let reversedAsset = originalAsset.reversedAsset(outputUrl)



         playerView = AVPlayer(playerItem: AVPlayerItem(asset: reversedAsset!))
         playerViewController.player = playerView

         present(playerViewController, animated: true) { 
             self.playerViewController.player?.play()
         }

    }


}

But its not working and this is what I end up with:

I think I'm doing something wrong with outputURL, please help if you know what to do

Problem was with output URL, this is the correct way to do

import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController {

    var playerViewController = AVPlayerViewController()
    var playerView = AVPlayer()


    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        let path = Bundle.main.path(forResource: "video", ofType: "mov")

        //Correct way
        var outputURL: URL?
        do {
            let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
            outputURL = documentsURL.appendingPathComponent("\(NSUUID().uuidString)newvideo.mp4")

        }

        let originalAsset = AVAsset(url: URL(fileURLWithPath: path!))
        let reversedAsset = originalAsset.reversedAsset(outputUrl)



        playerView = AVPlayer(playerItem: AVPlayerItem(asset: reversedAsset!))
        playerViewController.player = playerView

        present(playerViewController, animated: true) { 
           self.playerViewController.player?.play()
        }

    }


}