Digital Movie Making in Engineering

My engineering students are responsible for a portfolio at the completion of each course. I am interested in supplementing their binders with some type of online portfolio. One way that I could use a digital movie is with our "Marble Sorter" project. My students build some pretty neat things with these really expensive lego-like parts. The problem is that at some point, their projects need to be dismantled and the parts stored away for later use. Currently, I have the students take digital photos of their projects and create Word documents that include a picture of their creation, a narrative description, and a print screen of the program that runs their creation. Having them create a movie would not only be fun, but it would also allow them to better document their progress. Right now, my students basically take a picture of the final product and describe what they did. With a digital movie, they could describe and show their progress and make a much more interesting presentation.