There would be 5 individual worlds: metal, wood, water, fire, earth. People can walk around each world with mouse and keyboard on separate computers.
There would be one application including 5 worlds and people can walk around in these worlds.
For the last big app, I use Kinect to control the character. I did some research about Kinect.
Third person camera: lean left, right, forward, backward, jump
First person camera: Walk, face/body direction.