My kids want to make videos but I said they have to have a plan and at least an outline, if not a script, before I'll let them post anything because I want them to have a motivation besides "I wanna be a YouTube star!" So their videos have not progressed beyond random talking, singing, and dancing as they wander around the house and
yard with a camera. So they won't be posting anything at this time. They do want to join in when I make my videos and I occasionally let them but my videos are just Sunday school lessons for kids who can't come to our church for health reasons and I'm not trying to grow an audience.
Your son's idea to use videos to stay in touch with a friend sounds great!