Not to say many will allow this but... I have asked three providers so far to allow me to record and take pics during our session. I dont know if they would like this to be known to everyone so I am not going to name any names. I assured them all that they could keep their face off camera or wear a mask or cover any part of themselves that would make them more comfortable. I went out of my way to assure them their video/photos would be kept PRIVATE and I did not conceal my identity at all to assure them I had exposure too. I jumped through whatever hoops they wanted me to to make them comfortable. If they said dont record this part or take a picture of that I DIDNT EVEN TRY or push back. I RESPECTED their wishes. Out of the three I have asked so far...

1 said "I would allow it for an extra donation if we had seen each other a few times first and I become comfortable with you". I have not seen this provider at all yet. She is a very popular Chicago provider.  

I didnt ask one gal until after I had seen her 4 or 5 times and we were very comfortable with each other.
she said "Sure, if I can cover my face. And if my pics and video dont end up all over the internet next time I may not even cover my face." I asked her about extra donation and her reply was "I'm not going to charge you extra". When we were done I tipped her $100 anyhow. The session was allot of fun!  

The third gal I asked after seeing her 4 times. She is smoking hot in my book so I expected her to laugh and say "No Way!" She said... "If you will buy me a sexy mask to wear so I can help hide my identity and keep the video/pics to yourself or only share them with me!" She even allowed me to set up my tripod for some parts. Got some great video and a shitload of 12 megapixel stills of her\us together and of just her.
We went overtime by about 20 minutes. She never asked me for an increased donation but I gave her $500 when my normal hour with her was $300. It was WELL WORTH the tip!

I have not asked anyone else yet but so far not one provider I have asked has flat out said NO. It was hard to get up the balls to ask the first time, but the more ladies I ask that say yes the easier it gets to have the balls.