Videos for Events

What would these videos in reality do? Because seems like unnecessary work

Videos from youtube are good if you are referring to having background music, but and entire video created, planned, and coded into an article or page by a single team would take far too long to do, and if it doesn't rest on the shoulders of those team members in plot, or otherwise, does that mean it has to fall to the illustrating team? Seems like too much for too little.