IMPORTANT: You must have installed OpenCV natively for this to work, and if using Ubuntu with OpenCV installed via apt-get, you may run into library problems. I gave up on these as I only needed it to run on Mac for a quick demo, but if you do figure out where the correct .so is, please let me know or submit a pull request so it's fixed for all.
To use:-Build and run. -Ensure you have a camera connected to your computer. -Then, once the cube appears, move your head and watch as the cube responds.