SaveVideoToPhotosApp.swift

import Photos

func saveVideoIntoPhotosAppWithURL(videoURL: NSURL, completionHandler: ()->(), errorHandler: (error: NSError)->()) {
    switch PHPhotoLibrary.authorizationStatus() {
    case PHAuthorizationStatus.NotDetermined:
      PHPhotoLibrary.requestAuthorization({ (authorizationStatus) in
        dispatch_async(dispatch_get_main_queue(), {
          self.saveVideoIntoPhotosAppWithURL(videoURL, completionHandler: completionHandler, errorHandler: errorHandler)
        })
      })
      break
    case PHAuthorizationStatus.Authorized:
      PHPhotoLibrary.sharedPhotoLibrary().performChanges({
        PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(videoURL)
        self.view.userInteractionEnabled = false
      }) { saved, error in
        dispatch_async(dispatch_get_main_queue(), {
          self.view.userInteractionEnabled = true
          if saved {
            let hud = MBProgressHUD.showHUDAddedTo(self.view, animated: true)
            hud.mode = MBProgressHUDMode.Text
            hud.labelText = RS_SAVED_TO_GALLERY
            
            let time = dispatch_time(DISPATCH_TIME_NOW, Int64(3 * NSEC_PER_SEC))
            dispatch_after(time, dispatch_get_main_queue(), {
              hud.hide(true)
            })
            
            completionHandler()
          }
          else if error != nil {
            errorHandler(error: error!)
          }
        })
      }
      break
    case PHAuthorizationStatus.Denied:
      let alertController = UIAlertController(title: RS_SAVE_VIDEO_TO_YOUR_PHOTOS, message: RS_NEED_RIGHT_ACCESS_PHOTOS, preferredStyle: .Alert)
      alertController.addAction(UIAlertAction(title: RS_NOT_NOW, style: .Cancel, handler: nil))
      alertController.addAction(UIAlertAction(title: RS_YES, style: UIAlertActionStyle.Default, handler: { (alertAction) in
        UIApplication.sharedApplication().openURL(NSURL(string: UIApplicationOpenSettingsURLString)!)
      }))
      self.presentViewController(alertController, animated: true, completion: nil)
      break
    default:
      break
    }
  }