private func capturePhoto() {
        self.cameraEngine.capturePhoto { (image: UIImage?, error: NSError?) -> (Void) in
            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                if let image = image {

                    if self.currentModeCapture == .GIF {
                        self.frames.append(image)
                        if (self.frames.count == 5) {
                            guard let url = CameraEngineFileManager.documentPath("animated.gif") else {
                                return
                            }
                            self.cameraEngine.createGif(url, frames: self.frames, delayTime: 0.1, completionGif: { (success, url) -> (Void) in
                                if let url = url {
                                    dispatch_async(dispatch_get_main_queue(), { () -> Void in
                                        let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("previewController")
                                        (controller as! PreviewViewController).media = Media.GIF(url: url)
                                        self.presentViewController(controller, animated: true, completion: nil)
                                        self.frames.removeAll()
                                        self.labelModeCapture.text = "\(5 - self.frames.count)"
                                    })
                                }
                            })
                            return
                        }
                        self.labelModeCapture.hidden = false
                        self.labelModeCapture.text = "\(5 - self.frames.count)"
                    }
                    else {
                        let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("previewController")

                        CameraEngineFileManager.savePhoto(image, blockCompletion: { (success, error) -> (Void) in
                            print("error save image : \(error)")
                        })

                        (controller as! PreviewViewController).media = Media.Photo(image: image)
                        self.presentViewController(controller, animated: true, completion: nil)
                    }
                }
            })
        }
    }