OMG, I hope this isn't OT, but don't you H8 obtuse acronyms?
NEway, this is a WAG, but FWIW, I wanted to get you an answer ASAP, so I'll give it a shot... (YMMV).
IDK, but IMHO it could mean "Onsite 'Audio Visual Producer or 'Audio Video Producer', or 'Assistant Video Producer'? I'm guessing it's either someone who runs powerpoint (.ppt) ... or a production assistant (PA) of sorts. W/O more ConTXT, It's hard to C what they are going 4... so DQMOT.
BTW, wherever you read this term is the place to ask. Don't feel like it's an industry standard term though - at least I've never heard of it.
I think you are correct, Nick... but titles are weird and it's not above some people to call the guy carrying their tripod an "Assistant Producer" just so they can bill more.
But seriously, it's probably a person to run powerpoint/music-type things.
Full disclosure: I've only videotaped two weddings in my life, one for free as a favor to a friend - and one that had a video production budget in the tens of thousands of dollars - where I was only one of a crew of a dozen people. Guess which couple is still married?