Videos and names

Hi there Dejan, I just have a quick question. I recorded videos of my zoom teaching and I always had verbal consent of my students, since the video only shows me, nobody or nothing else. I do say the first name of my students though, when I correct them. Now since I am teaching a lot less online again I have been asked to put up a youtube channel. I initially didn't think I would ever use the recordings to more than just for my own analyzing process. But now I was wondering, is it a data right conflict if I say people's first name in the videos and would upload them publicly? They do not talk and most of them I could probably contact and ask if they're ok with it. Just in case I miss a name somewhere of someone I didn't ask, and I repeat I did never mention the last name nor are they seen anywhere, nor do I say anything but a correction to them, would this be considered a violation of data/personal rights already? Thank you so much in advance. I am sure you usually have other clients. Thank you so much for taking the time to read this.