Real Time Head Pose Estimation from Consumer Depth Cameras by Gabriele Fanelli 
download source and windows/OSX binaries: https://github.com/kronihias/head-pose-estimation
Application that detects head position from a depth image provided by Microsoft Xbox Kinect Sensor in x,y,z and Euler Angles (pitch, yaw, roll) from multiple persons.
–> needs no calibration!!
Application sends data as OSC Message in the format:
/head_pose [User_ID] [x] [y] [z] [pitch] [yaw] [roll]
- Open Sound Control (OSC) is a message based communication protocol for multimedia systems.↩