As someone who has spent time professionally behind the camera (for non adult reasons), and now works closely with various IT and personal security people, I have a few thoughts on this.
Over my punting career to date I've seen about 50 girls and filmed maybe a dozen of them. All of them were recorded because the punt was particularly unique for various reasons, but I try to find girls that will allow it so I have options on any punt.
For me it adds value to the whole event as you can re-live it countless times in the future. As we all get older, and struggle to perform, that's almost priceless

Infinitely better than an old wank mag, or paying for onlyfans.
I find there are a few types of girl who will allow filming.
1) those who want to do the filming or those who will only let you use their camera - and they send you a copy.
Personally not a fan of this as that would leave the footage in their hands. You have to trust them to send it to you, and also not to put your face all over their profile, or somewhere worse.
2) those who allow filming a few clips here and there, but don't usually want a whole movie.
This is fine most of the time, but they can get a bit picky about it.
3) those that don't really care what or where.
The majority of the girls I've filmed fall into this category.
My tips on filming a punt are as follows:
1) find a girl in category 2 or 3
2) set the camera / phone to record and just crack on with, don't concentrate on angles and lighting. it will probably affect your performance.
3) if you can, just set up the camera to one side and record everything in a wide shot. POV and closeup shots will never look as good as you think they will. Too much camera wobble, not enough focus.
In terms of equipment a phone works, and is convenient for most, but equally action cameras are bordering on disposable at this point (4k ones can be had for under £30 now off amazon) and are small enough not to bother anyone. Just set it up on a stand/tripod in the corner of the room, or bed side cabinet, pointing at the action and capture it all.
Then, if you're feeling up to it, use your phone, or a second cam if you have one, to record the odd POV or closeup shot.
After the fact, store the footage somewhere safe (not in your car). Ideally encrypted (look up veracrypt). And back it up to another drive, or cloud.
I might also suggest recompressing the footage using something like handbrake. This just makes it easier to find somewhere to store the videos as the files are a lot smaller.
If anyone wants / needs a guide on the encryption, compression, and backup ping me a DM and i can walk you through it. Or if theres enough demand i can put together a public guide in a post.