I used Adobe Spark to make a video about the seasons. I attempted to use it simply and add in photos to describe each season and then use my voice to narrate information about the seasons. This app is simple to use to make a basic video, but I am sure there are many more features than the ones I used in this video. It would be cool if you could add clips from youtube into the video, but I don’t think there is a way to. The app is very user friendly, and students would be able to create projects on it.
Good “story idea” and bonus for Gif! You can download videos from YouTube and then you should be able to edit a bit and upload to Adobe Spark Video. You’d still need to be concerned about copyright of the video you used.