[pittendrigh]

Good point. You are right. This can be done with raw HTML now. And kindof/sortof with Sigil. I think so anyway. Edit epub with sigil, so it embeds video, working on your localhost. Save as epub3. Then use something like calibre to export as HTML. Then scp the raw HTML up to the server. I think you need a hacker to install various plugins first. I don't think any of the open source softwares come out of the box able to do this.

And you could simply edit raw HTML with a text editor so it looks like a book. But it takes huge self-discipline. There is no software I know of that enforces a book-like look and feel, as you make your HTML.

It would be interesting if you could simply scp a *.epub3 up to the DOCUMENT_ROOT of a web sever and have any not-extension-enhanced browser automagically show it. So it looks like a book. And so it can display live video, embedded inside the pages of the book.