I'm pretty sure this is a job for Lawyer Man! It will depend entirely on the wording of your contract and how it pertains to existing copyright law. I would go to your state's bar website, find a local IP attorney (ask for rates and see if they offer any sort of free consultation or if they can do a quick phone consultation). Maybe yes maybe no. Worse case, it's worth the couple extra bucks to find out right now from an expert rather than guess wrong for free. What is your time and footage worth?
Finally, see of you can renegotiate the deal so you can use the footage for self-promotion. Also, I'm pretty sure unless explicitly stated, you have the right to display your work for self-promotion no matter what you create. Remember, as creator of a work of art, you retain the copyright unless you formally re-assign it to someone else. But, again, spend $50 and talk to a lawyer.
Jonathan Ziegler
http://www.electrictiger.com/
520-360-8293
