If you're hosting (or taking part in) one of the hundreds of football camps across the country this year, there's no logical reason that you shouldn't be filming it.
Here's a good example from the Tony Johnson OL5 camp for offensive lineman in Texas. They had over 100 big fellas show up, and 14 of them are guys with early offers that are just looking to get better. This video showcases what they were able to accomplish, and it will serve as a great tool for players in the future who consider attending.
Whether you run a youth camp, or a camp aimed at top tier prospects, getting some footage of the camp structure, and players enjoying themselves is the best (and most cost effective) method of advertising that you can do as you look to grow from year to year.