Create Windows 10 app with OpenCV:
1. Show the camera in real time in full screen in app.
2. When we detect a face near the camera, still for 1 second, start a countdown of 3 seconds: show in big letters 3, 2, 1, and take a photo.
3. Upload the photo to our web service.
Note: in case we have multiple cameras, we should be able to select which camera to use.