Of course the teachers themselves wouldn't be expected to create high-class videos but would just have their audio/video recorded whilst they go through the book on an iPad or something similar where they can do any annotations. This then gets passed on to editors who can do a good job, particularly for lower level classes/courses. For the more advanced courses, a lot of editing probably isn't necessary. Just the actual content should suffice. The other benefit this could have is similar to skillshare, the courses can be free, or they can be paid for, which is another avenue for ulema to be paid whilst also freeing up their time.