It's your wedding, not your mother's.
My MIL tried to take over my wedding too. She wanted our wedding to be
ALL ABOUT HER (and by the way, there's some guy in a tux and some chick in a white dress here too). Sound familiar?
DH and I put our foot down and had the wedding we wanted. (It helped that we were paying.) But it sounds like it's too late for you to do that with your mom.
If I were you, I'd elope. Drop by the courthouse, then go to a nice romantic restaurant for a quiet dinner for two, then get a hotel room and shag like bunnies.
Or whatever the two of you would like to do. It's not worth the trouble of dealing with a Momzilla.
BTW, I just have to say that a videographer has to be the SINGLE BIGGEST WASTE OF MONEY in the wedding industry. Seriously, how often does a couple look at each other on a Tuesday night and say, "There's nothing on TV, how about we pop in the wedding video?"