Totally doable. People are very willing to pay for personal training as a supplement to a video course. I've done this before, except I also charged (much less) for the non-hands-on part, but the far more expensive 2 hours of one on one training sold out first.
Another interesting example in this area is Michael Hartl with http://ruby.railstutorial.org/ which is now perhaps the most popular Rails tutorial out there. You can read it all online for free but he makes very good money selling the PDF and screencasts of it.
Hmm. My course is on Udemy (i didn't want to create my own platform). I've got over 1.5hrs of video content, worksheets, examples, quizzes and live workshops. I'm struggling to quantify the right amount to charge for it.
Another interesting example in this area is Michael Hartl with http://ruby.railstutorial.org/ which is now perhaps the most popular Rails tutorial out there. You can read it all online for free but he makes very good money selling the PDF and screencasts of it.