I do not think it's easy to teach kids about bitcoin, this is because bitcoin needs a more complex understanding than others, but I think the best way is to present the video, the child likes the visuals so the videos are easier to understand.
If bitcoin is truly complex, it would take more than a video for someone to understand it. As an example, try hydraulics. You can show me a video lecture about hydraulics but I wouldn't understand them right away because it's complex. It has pre-requisites so it will take months before we can get to understand that subject. But bitcoin isn't like that. We all know how a wallet works. We all know how money works. Every layman can understand how bitcoin works and it will not take as long.
If the child doesn't have bitcoin's pre-requisite ideas, then showing a video will not make them completely understand about bitcoins even when they love seeing visual stuffs for learning.