Yes, I've done a little video rendering with mine too, and it does the job well enough. However, the people at the Apple store also warned me that doing a _lot_ of video rendering/conversion/etc on an MBA will shorten the computer's lifespan because this computer "isn't designed for that" (their words).
Video rendering was, however, the only type of use they warned me about. Anything else you might want to do with this computer, it will do well, and for a good long time (as long as you take care of it).
Rendering one or two videos isn't going to kill the machine -- but since the OP's question was specifically directed toward the computer's durability .... well ....![]()
i suspect they are talking about the life of the SSD. i wouldn't worry too much about this.