Video walkthroughs do not belong inside of products. I would even go so far as to say if you need a video walkthrough to explain how to use your product or features in it, your design and experience is fundamentally flawed.
A walkthrough video is like pouring molasses on all the potential energy your customers have. You are taking a user from an active role to a passive role and asking them to remember a recipe or incantation for how to get your software to do the things that you promised them it could do.
