I have created an ePub for my students to use which includes embedded video. This add-on would be a tool of last resort as it does not display the background colour in my emphasis boxes which makes it of extremely limited use. Also, there is not 'bookshelf' and users have to load the book into the reader every time which is unsatisfactory. Finally, the settings are hidden at the bottom of the screen and figuring out how to make the ePub display as one column instead of two was too hard.