Well it's actually an Asus knockoff of a kinect sensor, but it works well at tracking up to 2 players.
In Unity you can add triggers/colliders to your hands/elbows/knees/feet, to allow you to hit things. You can also attach triggers around you to allow you to switch weapons/spells. I just rigged up a simple fireball toss by doing an over head throw.
With triggers you can make different arrangements, if you put your hands together you could trigger a different spell than using one by itself or if you reach for your hip you could switch to a sword. Lots of possibilities....
If you throw a fireball all the way to the target (white cube) it triggers an explosion:
And a little demo where you punch a skeleton to kill it and another one spawns and comes after you.