I totally get you. My nervous system thinks I’m being hunted for sport😭
I do breathing exercises, put on music whilst I go over my notes, drink plenty of water and remind myself that it’s just me talking to a camera. Remind yourself to speak at a reasonable pace, and if you mess up, just take a breath and carry on. I have the habit of speaking fast because I want to get it over with, but speaking at a slower pace gives your brain more time to think and you’re less likely to mess up!!
It goes way quicker than you think, and by the time you get to the last couple questions, you become acclimatised and it doesn’t feel too scary
Good luck!!