Well I'm currently looking for a job, however the last 10 (so this is a good time to review it) interviews all apparently went "poorly", the result was; "we found a better candidate". Even though apparently there's a huge lack of people who try to work in my field.
Now I have no idea why they went poorly and I always had the feeling everything was amazing during the interview. So to me it's a real surprise. Now I do have difficulty seeing social "hints" or subtleties, doubly so when under stress. (And I'm literary shaking from stress during a job interview, if I'm not getting a blackout - but that's just something I can't solve quickly).
Now to get "better" at this I need to have an objective look: and while practice with friends/family my friends always state I'm doing "fine", apparently I am not: so to review this, would it be acceptable to put a camera while I go to a job interview so I can review myself later?
And I'm literary shaking from stress during a job interview, if I'm not getting a blackout - but that's just something I can't solve quickly. Your question about video actually seems like a red herring here: the real issue is that you have a near-uncontrollable stress reaction to interviewing. Having video of yourself reacting this way doesn't change the fact that, regardless of how long it takes, you're going to need to solve this issue. So I would focus on how you can do that rather than trying to get an interviewer to agree to being recorded.