Today on a call, we were talking about how "umms" and "uhhs" in videos can be okay, if done with moderation. And also that instead of saying something like "right?" or "yeah" (or any other filler you use to give you time to think) you can actually say nothing. And usually the pause you make will come out much shorter than you think (you can see this after you actually watch your video).
Of course we're not Steve Jobs, but check out how long he gives himself to think before he actually answers a question.