Here is some transcription from the video if you want to take notes and attempt yourself:

• At the heart of the lego tank is an embedded arduino microcontroller
• A W-Fly module ac ts as a wireless port
• The port is configured as a TCP server with the computer as a client
• The data from the ui is sent to the tank via wifi

Some of the features also include full suspension, estop on communications loss, a dual rubberband gun, automatic lights, and a live video feed!

Just secure your smartphone to the front for a video feed and you can watch the stream of your lego tank robot from anywhere.  This is awesome congrats on a cool use of arduino!