Nah, sorry for raging here. It wasn't called for, and I want to apologise about this whole situation. But I'm not going to lie, it felt like a complete waste of time. It wasn't, I was enjoying all the time while I was talking, but just something broke inside me when I've launched the recording and saw how it suddenly stops refreshing the video. I wanted to believe that it was just something about this program. When it failed to deliver on different five media players, I was done.
After thinking for a moment I have one more thing to add that I did not flash out in my would-be recording. Roots of unity and their properties are not crucial but provide certain insights into operations on complex numbers.