Sometimes you capture something in your video that you don't want identified, such as a license plate, a person, certain text, trademarks, etc. I found these quick tutorials over on Bob Donlon's blog that show a couple ways to handle these situations. The first tutorial shows how to obscure a stationary object, in this case a license plate on a parked car. It uses Premiere Pro but you can use the technique in any NLE. The second tutorial shows how to use After Effects to blur the face of a subject and then use motion tracking to follow the subjects movement. Now you know what to do when Uncle Jeb insists you remove him from the family video.