Like Michael commented: this looks like a cable/connection problem.
I have something similar on one of my laptops, where I get the lines you see in the video. In my case pressing on the GPU part of the motherboard stops the flickering, but it also depends on the angle of the screen.
This makes me assume it’s a cable problem, that’s not connecting properly.
I wish you luck with opening it up, but if it’s still got warranty, I’d sent it in… Even though you’ll have to miss your laptop for three months
I had this problem with my ASUS laptop. Since it gave me lots of headache, I removed back cover and remove dust on VGA chips. It solved the problem and it occurs again whenever dust accumulated on chips through ventilation hole.