How to save video clip to Photos gallery - ios 8 & 9

Question

I had work out to save video clip to Photos gallery. Here the code as below, but it not working. Even though the saveVideo return true, but I open Photos gallery can not get the video clip.

filepath

is the location on local Document directory

func saveVideo(filePath: String) {
  UISaveVideoAtPathToSavedPhotosAlbum (filePath, self,"video:didFinishSavingWithError:contextInfo:", nil)
}

func video(filePath: String, didFinishSavingWithError error: NSError?, contextInfo:UnsafePointer<Void>) {
    if error == nil {
        let ac = UIAlertController(title: "Saved!", message: "Your altered video has been saved to your gallery.", preferredStyle: .Alert)
        ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
        self.presentViewController(ac, animated: true, completion: nil)
    } else {
        let ac = UIAlertController(title: "Save error", message: error?.localizedDescription, preferredStyle: .Alert)
        ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
        self.presentViewController(ac, animated: true, completion: nil)
    }
}

Answer 1

PHPhotoLibrary.sharedPhotoLibrary().performChanges({ () -> Void in

        let createAssetRequest: PHAssetChangeRequest = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(NSURL(string: filePath)!)!
        createAssetRequest.placeholderForCreatedAsset

        }) { (success, error) -> Void in
            if success {

                //popup alert success
            }
            else {
               //popup alert unsuccess
            }
    }