You're asking the wrong question. Maybe you are new to all this Linux stuff, but you can run KDE software under GNOME and vice versa, this is extremely common. Pick which ever DE you like the most by itself, and independently pick the editing software you like the most.
Bro desktop environments don't have video editors. That's why they're desktop environments. KDE makes a video editor called kdenlive. They also make a desktop environment calls Plasma. These two things have nothing to do with each other.