Me and my friends where all taking and we came cross an idea, that we make videos to help people understand how to use the plugin, and I was wondering: do you needed permission from the plugin creator to do so? Sorry if this is in the wrong section.
Midnite As long as you provide a link to the plugin (ON dev.bukkit.org) and give the creator credit, you should be okay, though if one of the plugin creators sees your video and would like it taken down, you would need to follow their request as it is their plugin you'd be showcasing.
I agree with Jade, But if you can easily contact the author or manager of the plugin I would ask them. Maybe if they like it they will put a link to your video on the plugin page!