360 videos are just like 360 photos. The only difference is if you target mobiles, make sure the target platforms loads a format that is supported (I'm looking at you Apple!).
Watch on your phone using https://fabien.benetou.fr/pub/home/AFrameWorkshop/360Videos/
Your turn now, extend this 360 video by adding, positioning AND correctly timed relevant elements http://jsbin.com/fupomib/edit?html,output
It can be text, primitives 3D meshes, etc but also interaction. One example could be to pause the video until the viewer correctly answers a question.
To learn more on how to shoot a 360 movie check the Cinematics Storytelling workshop and its recording.