This was well worth a post – Although similar multiple person tracking can and has been done before (using Isadora infact) but this has many advantages such as being able to use it in the day and night as well as much more data/information and flexibility.
From the YouTube Information:
Automatic detection and tracking of people with several microsoft kinect cameras in real-time. Cameras are connected to a single laptop. People are detected given the noisy depth measurements from multiple kinects. Stationary and moving people are detected in day or night time or with highly varying lighting conditions.
(Work partly funded by the FP7 European project APIDIS)
Check it out: