From what I heard it is easy to pick-up the API those people who create plugins for a very long time.
I think video tutorials aren't practical anyway and text ones are better, as you can re-edit at a wimp as time goes on and spigot goes through aging stages rather having to re-doing the tutorial with the wholesome video. Jed, Finn, and Sobki at done video tutorials and after time have passed they deleted it. Though I'm acknowledged that it did help some folks and came neatly to them.