This project is based on eaglesky's HandGestureApp.
I've upgraded OpenCv to 3.3.0 and tried to remove most of the native code there was without affecting the project's intended funtionality.
Original Github Project: https://github.com/eaglesky/HandGestureApp/
Project Page: http://eaglesky.github.io/2015/12/26/HandGestureRecognition/