go to 0:05 when the car comes out of the person's head, you can see the path being built followed by the car driving on it. I'd like to know how to make the effect of the path being built from an object.
There are a number of ways to do this - bearing in mind that your example is a very complex version of what you're trying to do. One way is scripting, another is masks, Lofting or Pro Booleans will also do it. Here's a free script called Grow, which would get the vegetation part of the animation done: