ofxHeadPoseEstimator is an addon for openFrameworks
Actually, it's not a proper addon yet. Right now it's just an example, but I wanted to get it out there for other people to play with even before it was wrapped into an addon.
The code was originally written by Gabriele Fanelli and integrated with openFrameworks by David Sans Kirbis.
To run the example, you will need to download the trained trees and put them in the example/bin/data/trees/
directory. You can also download the original file from Gabriele, but be warned it's >5GB.
The HPE code is distributed under the Microsoft Research Shared Source License, as it is an adaptation of Hough Forest Code.