Video editing help...?

Well... about a month ago i wanted to spin around and jump on a whoopie cushion which was sitting on an office chair with wheels (yeah don't ask).... I ended up hitting my head on the desk and falling to the ground. My sister happened to get al of it on tape it's so funny and I want to upload it to face book bu it sows some major wedgie action.. LOL!!! Is there any way I can pix elate or draw on the video like a little black box or something s my crack isn't all over the Internet??? Thanks!