Save video from URL to camera roll

PHPhotoLibrary.sharedPhotoLibrary().performChanges({ () -> Void in
      _ = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(outputFileURL)
      }, completionHandler: { (success: Bool, error: NSError?) -> Void in
        if success {
          print("successfully saved video to camera roll")
          
          do {
            let _ = try NSFileManager().removeItemAtPath(outputFileURL.path!)
            print("Successfully removed saved video file from local directory")
          } catch let error as NSError {
            print("Error removing the file from the local directory: \(error.localizedDescription)")
          }
        } else {
          print("error saving to camera roll: \(error?.localizedDescription)")
        }
    })