No, but i'm guessing they were using ramps. The way you can access them is ONLY on a Blackwood Track, so GP, GP Reverse or the carpark. When you load one of them tracks, press SHIFT + U on your keyboard and you should get a menu at the top of the screen, under one of them buttons you will see a ramp button appear, click that then place it somewhere in game.
press O to place an object. (It took me an age to figure that one out). I have seem some particularly skilled drivers lift off to a two wheeled sustained turn from kerbs without using a ramp. This isn't a mod, it's simply that they're damned good stunt drivers. Obviously they've set their car up in order to keep the car there once on two wheels, but getting it there reliably is just incredible.