Does Elixir on Exercism sort of do what you’re after?
The problem with producing content that ‘extend’ books is copyright issues - so you couldn’t use content from any of the books. Of course you could pester book authors to create video courses that complement their books 
I’ve been trying to get @sasajuric to do one for ages 
something in the same sort of format as PragDave’s course.
I think it would be nice to see similar courses from all book authors 
