FSP has a recent post up about video recordings of conference or workshop talks.
I've given about a dozen talks at various conferences and was not recorded in any official capacity. I suppose someone could have aimed a webcam at me. I'm still involved with that instructing gig I mentioned ages ago, but that has never been recorded.
Would I mind if one if my talks/lectures were recorded? No, not really. I would rather not have that knowledge sprung on me at the last minute, because I would probably panic about the state of my hair/clothing/whatever. At the same time, I'm not sure I would want to watch the result. I hate how I sound on voicemail (although I hate leaving messages, so hopefully I don't sound that silly normally), and I can only imagine how much I could fixate on my various mistakes.
I was lucky in that I had some brutally honest friends in grad school ("you really like the word 'um', don't you?") and I think they broke me of most of my verbal tics. I don't think an video of me would be traumatic to watch. But ask me again after I see a video of myself...