I suppose the operative question is, what sort of things can be done after hacking into a webcam?
If all that can happen is that the person can see your picture feed, then yeah, that's a rather frivolous thing to worry about. If you're going to be doing embarrassing, private, confidential, or incriminating things in front of your webcam, then hackers are the least of your worries, IMHO.
There are a number of other perfectly good reasons not to use a webcam, I will say. I'm just a bit dubious about this one.
Peace & Luv, Liz