Hiya Roxcy, Welcome to MR.
Your very first post asks a question that has been a little hot lately.
Watch the following thread closely over the next day or so and you'll probably learn a little bit about what conforms to ePub standard and doesn't. You'll probably see a political side to conforming to epub rules as well.
https://www.mobileread.com/forums/sho...d.php?t=121632
Meanwhile: The answer to your question is really NO.
Video and audio can be incorporated into non-conforming ePubs which are viewed in Apple's iBooks app which only has an Apple demographic.