I think it would be better to have a small cosmetic change on the seminar videos - at least it would make more sense for me.
In Seminar 2, the Vim window is on the left of the desktop, and there is browser window on the right. At the bottom right we can see the keys you press as you press them.
At least for me, this arrangement breaks concentration since my eyes need to move from left to right, and are not fast enough to catch the keys. I have to constantly rewind to check the keys you’ve pressed.
I suggest you keep the vim window on the right of the screen, making it easier to see what you type in the same window you type it!