How to use gestures to perform a specific activity in unity using kinect?

Im actually making a photo booth using kinect and unity. I want to use a gesture which kinect can detect for the picture to be taken. I have no idea on this so it will be really nice if u can give me some idea on how it has to be done.

I hope this can help:
http://wiki.unity3d.com/index.php/Gesture_Recognizer