This is a good idea to somewhat get them interested in it while having fun watching it, but again, kids are always kids, and they are not serious about this stuff first as they always want to have fun with you or with themselves, which again, we shouldn't force them to do. Videos are really helpful; even an adult can still watch them and have fun with them. Even before I saw this on social media, I watched it multiple times as I am still a kid at heart.
Watching video that is related to bitcoin can be interesting for children but it doesn't mean they will still have interest to know Bitcoin and to understand it. Whatever is beyond the understanding of children their is no how things can be forced on them to make them have interest in it. Children watching bitcoin video will only enjoy it only all in the name for fun. Bitcoin video will only be productive to the understanding of those who have already grown up, with the video it will be very easy for them to learn. Kids will always be kid, what they can't understand, is always beyond their them .