The epub3 specification already supports the possibility of embedded audio and video. It isn't well supported by the various vendors yet, like Kindle, PlayBooks, Mobi etc. It is now already supported to some degree. But not well.
Because the epub3 spec supports embedded multimedia it is only a matter of time until the vendors do a better job supporting it.
In the meantime I use HTML5 on my website. I use video embedded in webpages (when needed). The HTML is generated by python and php. I wrote the codes. My pages act like an ebook. My customers like it. I teach boat building. The book like HTML format has been a big success.
I have NextPath, PrevPage, GotoLastRead, collapsible TOC. Searchable keyword index will happen this winter. My coding annual season generally starts in December.
So no. Previous comments about "This has to be a new app" are incorrect. Epub3 allows for it. It's coming.
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