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Clue is in the name. The ebook.
Embedded video and audio are incompatible concepts to real books. The entire point of ebooks is to do a printed paper book in a way that it works on any screen and without the internet or much battery / cpu consumption. You want to be able to read solidly for days without charging.
You get only hours with video. Audio isn't so bad.
Either it's a book or not.
What you describe is better done as an app. It's not an ebook. The epub3, which Amazon doesn't really support, has features that allow multimedia and interactive. IMO that means epub2 is a proper ebook standard and epub3 is trying to compete with web content and apps. A subset of epub3 will work on many ereaders.
But even on the Web much "multimedia" is inappropriate. It's far better to have an app if you want video and audio and interactive. For a while Flash was used (it's not just a video player, but similar to Java with extensions for video, audio and animation). The iOS and Android apps are a better solution.
So either do real ebooks (epub2 and upload that format to Amazon KDP where they convert for whatever Kindle or Amazon App their customer has), or create apps for tablet & smartphone. There are frameworks and tutorials to get you started.
People using eink don't want audio / video. They are wanting to read. People using Apps on a phone or tablet are as happy to load an app as an ebook into the app they installed.
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