No image on recorded video by GPUImage2.

[MorningStarJ]

No image on recorded video by GPUImage2.
I will appreciate if there is some one could help me find out a solution.

   override func viewDidLoad() {
        super.viewDidLoad()

do {
            camera = try Camera(sessionPreset:.vga640x480)
            camera --> renderView
            camera.startCapture()
        } catch {
         }
}

func capture(_ sender: UIButton) {
        if (!isRecording) {
            do {
                self.isRecording = true
                let documentsDir = try FileManager.default.url(for:.documentDirectory, in:.userDomainMask, appropriateFor:nil, create:true)
                let fileURL = URL(string:"test.mp4", relativeTo:documentsDir)!
                do {
                    try FileManager.default.removeItem(at:fileURL)
                } catch {
                }

                movieOutput = try MovieOutput(URL:fileURL, size:Size(width:480, height:640), liveVideo:true)
                camera.audioEncodingTarget = movieOutput
                movieOutput!.startRecording()
                DispatchQueue.main.async {
                    // Label not updating on the main thread, for some reason, so dispatching slightly after this
//                    (sender as! UIButton).titleLabel!.text = "Stop"
                }
            } catch {
                fatalError("Couldn't initialize movie, error: \(error)")
            }
        } else {
            movieOutput?.finishRecording{
                self.isRecording = false
                DispatchQueue.main.async {
//                    (sender as! UIButton).titleLabel!.text = "Record"
                }
                self.camera.audioEncodingTarget = nil
                self.movieOutput = nil
            }
        }