Not within QuickTime itself unfortunately, try using Automator and create a workflow. I tossed one together just a moment ago to see what can be done and it looks like you can achieve this through the automator. The nice thing is you'll be able to reuse it so if you want to perform the same function on later VOD's you can by using your Workflow Automator.
Since I'm not real sure what you're running or how it interfaces with Automator, I can't be too prescriptive but this is usually a trial and error process anyway. I'd give it a shot and see if you can get that to work for you.