Around the Corner – How Differential Steering Works is a video from way before I was even born. It explains the principle behind how the wheels of a car can rotate at different speeds when they seem to be connected to a single shaft.
I suggest skipping directly to the 1:30 minute mark, unless you want to see those bikers show some moves.
P.S. If you like watching people do MOVES on Bikes, then here is a video showing that PAKISTANI’s aren’t far behind