Limb IK Not Working

The limb IK is for the arms so they don't bend weird or drag like stretch armstrong. 
In order for Limb IK to work, you have to first go into Rig mode, select your puppet, select each arm layer individually and adding sticks, and draggers, and handles (on shoulder, elbow, wrist). Then once your arms are all rigged and draggers are working, you can take the handles (on shoulder, elbow, wrist) back in Rig mode in Tag section on right. Then your Arm IK should work.

But like mentioned below - this is COMING!
https://youtu.be/pCKMpTE4Cu8

hope that helps!

Mark

Body tracking is still in beta testing. It won't work unless you are using the latest beta version of CH, which it does not appear that you are.