Please forgive me if I have posted incorrectly.

I need some help on what program to use, or if it is possible to do.

I have a few home movies i'm trying to put together for family. The person in the video is in the center of the movie, but the area around the person shows a messy house, boxes or some other not so picture worthy area. Is there a program that would allow me to crop or put a border or even black out or blur certain areas of the movie frame so only the center is showing or clear? I'm using AVI files and windows movie maker.

Any help will be greatly appreciated.

M