Jewelry Boutique

I have an animation I'm working on, and it involves a stick figure playing a guitar solo on a custom Guitar Hero controller. Unfortunately, since he's a stick figure, his fingers are way too small to be seen from the "show all" view. Can someone teach, show, or help me figure out how to make a square (100X100 pixels) that zooms in on the fret-playing hand? As in, the square acts as a "picture in picture" display and shows the hand playing. Also, I really don't want to have to copy the hand and manually enlarge it.