I'll let Mike have the last word, and throw my comment in here.
The gymkhana videos are entertaining, and those drivers are very skilled and talented.
But...
They co-opted the word Gymkhana. The original meaning is an event similar to autocross, but with a course that criss-crosses back and forth over itself, involves turning around a single cone in 180, 360, 540, or 720 degree turns, and the driver must also memorize an intricate course that is not marked with lines or laid out in a pattern that it could be driven without memorizing it from a map. And like autocross, they don't get practice laps or a chance to drive the course before their timed runs.
The gymkhana videos are shot and presented as if what you are looking at is the first attempt. But looking at the pavement, there are tire marks from dozens of previous attempts. The first video of the car on the abandoned airfield had concrete that was nearly uniformly black with tire marks. The footage used for the video is the successful attempts. Who knows how many cars they cracked up on concrete barriers or trolley cars or whatever else they are sliding circles around and past. And with the sponsor dollars and advertising use of he video footage (shown at the auto shows in the Ford booth, used by the energy drink companies, etc.), you know they have a parking lot full of back-up cars that quickly get turned into body shop repair jobs. Consider that these are the same drivers competing in the drift competitions, and they usually have their bumpers held on with zip ties by the end of a day's competition.
It would be interesting to see what these guys would be capable of at an autocross, going out on a course cold, and not having a half day or more to make practice runs before they turn on the cameras.