Getting a buttery smooth tracking shot requires special camera gear, like a Steadicam rig. It also requires a skilled operator, very unlike the man in this video. Demonstrating a stabilizing rig at the recent Cine Gear Expo in LA, he failed to keep a secure hold on the Arri digital cinema camera it was supporting, resulting in an incredibly expensive mistake.
Source: io9 – Watch a Fool Destroy an Expensive Cinema Camera