How to blur/censor faces

I have a video and I want to blur some area in my video.
How to do that?

Add your clip to the compositor. Add a mask at the right place over your image (use the render result window). Add a blur and send the video into it and the mask shape into the blur size plug. You can even keyframe the movement of the mask shape or attach it to a tracker.

Thank you very much. :smiley: