Microsoft has published a set of great tutorials for making applications with Kinect 2. http://kinect.github.io/tutorial/ These detailed hands on Lab/Tutorials for V2 were published last month.
I highly recommend the tutorial on tracking strategies - for keeping the application accurate when multiple people are in the room.
This lab will explain the following:
Tracking a user who is the first to be seen.
Tracking the user who is the closest to the Kinect 2.
Tracking a user who is the most active in the scene.
Tracking several people simultaneously.