I love this idea, and it has crossed my mind recently. It came to me when I "donated" my sunglasses to the Atlantic Ocean on vacation and was looking to buy a new pair! This is a great topic.
I didn't even think to use it as a training video! I love that. Sometimes I really have to think on my feet and solve problems that don't always have a clear-cut solution. I like that you could have a folder or database of similar work, with unconventional ways of how it was completed.
I thought it could be useful also to send to a client in Jobber after the work was done; to really showcase how much work goes into something they may never see. Maybe not every job, but the ones where there is work in a hard to reach/see area.
I ran this past my trainee, and he laughed and said, "You would have to delete the audio with all the talking we do!"