Fist vs manual tracking Kinect SDK v1

I want to track if I make a fist, or if my hand opens.

As below:

http://channel9.msdn.com/coding4fun/kinect/Simple-Hand-Tracking-with-MS-Kinect-SDK--WPF

Now I have a problem that I am doing this in C ++, and that the old kinect version is used in this example.

First, I have a problem displaying only the handle in depthView, and then im will have a problem to determine if it is a fist or a hand.

I look forward to your help