As far as I can see there is no way to generate markers from video thumbnails in Cubase.
It’s so convenient to have the program find the important events of a video (even if you have to adjust things) so that you can plan your composition.
Logic has that and although not perfect it helps tremendously. I wonder why video capabilities are so crippled in Cubase (because of Nuendo maybe?..).
Anyway, it would be nice to see a basic function like this in an update in the future.