Having the ability to obscure or highlight a moving object. I invision while playing a video, creating a box and having the ability to dynamically movie it by mouse that would obscure the object that needed to be hidden. Conversely, having the ability to obscure all _but_ the window, to emphasize the item is important. I'm aware of being able to do this already, but if the object (say, a face that needs to be hidden) is moving, the current version is very cumbersome to accomplish this. We use Camtasia for redacting or highlighting / emphasizing objects (typically faces) for court proceedings.