From the age of Face Detection, we have come to an age where Face Tracking is feasible without a professional setup. All you need is a decent machine with a Kinect. If you have tried / tinkered with ofxFaceTracker, faceAPI or FaceDetect, I am sure you will love this. FaceShift can now be downloaded from their website. Kyle has developed a ofxaddon ofxfaceshift.
My observations: The tracking is very accurate and was impressed with the way it tracks the blinks and eye ball movements. Frame rate is good and the tracking does not have any gittering.
All this said, it comes with lot of limitations. Most of them comes with kinect. Like the minimum distance where the user has to stand / sit. Lighting conditions etc. and you have to train the software with few poses for good tracking results. So still its far from usage in realtime setups. But as of now can be used for animation, expression tracking etc.