Videos can add to the quality of the hub most especially if it's related to what you're writing about. But ideally, you don't get any revenue from the videos. All revenue comes from ad clicks and impressions.
I use videos all the time though. It adds to the content. Like, I always think, if I'm surfing looking for something, there are times when I don't really want to read that much so I'd prefer watching videos sometimes. Maybe there are surfers out there who are like that. This gives them more time in your hub and spend more time looking around at links they might find interesting.