I recently had a wedding where the grooms father was a professional videographer as well.
4 pews from the front, both sides, DUAL SEATED TV quality live view Sony Cameras. 2 operators for the top stable cameras. 1 Camera man in the back of the ceremony. 1 Camera man ON THE PLATFORM, I kid you not in every wide angle shot.
I moved more in that wedding than I usually do, and I'm a MOVING photographer. I had to get an angle. I purposely left shots with the camera men in their gallery.
Then dad was shoot over my shoulder all night, especially during the formals where I had 1 camera man, and Dad with his new D50 with softbox.
If it was anyone BUT dad, I would of said something. At the reception I mentioned to him politely, "Man, I wish I had a great shot of you and your wife but you've been running around all day with a camera around your neck." He stopped shooting much after that.
All in all though, I made it work. I'll post a shot sometime. These camera men in the 4th pews killed my wide angle shots of the church, totally ruined that shot.
-tmiller
Tim Miller Photography
http://tmillerphoto.com