You can actually add videos to your Kindle book and sell it for a higher price. Note however that the video version is supported only for Fire devices. Checkout - Kindle Textbook Creator - https://www.amazon.com/gp/feature.html?docId=1002998671
FYI I just chatted with Amazon and unfortunately I can only do one version of a Kindle book, so I'd have to get rid of my natural Kindle book in order to sell an eTextbook version with videos. They said they're looking into allowing creators to sell both though so fingers crossed that happens soon. I would love to be able to sell a version of my video package through Amazon.
