Since Youtube started using the new widescreen 16:9 video format, I have been trying to figure out how to make my videos fill the player. Trouble is, I only had a 4:3 camera, and used windows movie maker to do all of my editing. as it turns out, windows movie maker has no build in cropping feature. It does, however, allow for very easy creation of custom effects. This msdn site was used as the basis for creating this custom effect.
Turns out, it’s very easy to create your own custom cropping tool.