// This method will try to register initial 5 guide to be used in verificiation later.
public async void RegisterInitialUserFace(int numFacesRegisteredRequired)
{
//Set up frameGrabber and start FaceAPI.
var frameGrabber = new FaceDetection(numFacesRegisteredRequired);
await frameGrabber.StartFaceDetectAnalysisAsync();
Debug.WriteLine("Finish registering faces");
}