Players who discover any confirmed cheats should, under no circumstances, exploit or disseminate such information. Instead, we ask that players file a report by using the in-game command [System Menu] -> [Support & Information] -> [Contact Us] -> [Report Cheating].

Taken from the banned player report. Probably your best way to report them.
What I do, is I use /echo <t> on each character I see that I suspect, so I have a log of their names in my chat log, making it easier to copy and paste into the report.

I would advise you to edit your post and remove that youtube link. In fact, might wanna delete the video from youtube as well. Garbeled names, bots, or not, it's against the rules to name-shame anyone, ever, for any reason. You may find yourself in trouble for doing so, as you cannot call someone a cheater. Only the GMs can do that.