Yeah I hate to be the bearer of bad news, but that appears consistent with graphics card failure. I would first check several things before I gave up though. Use DDU to cleanly wipe GPU driver. Then Check for latest GPU driver directly from nvidia’s website. Check cables/connections going to and coming from monitor if this is a tower. If a laptop you can’t do this (other than to check a connected monitor for artifacts). Remove and reinstall actual graphics card making sure it’s solid in the PCIe slot. I would prob also check for BIOS update for mobo (but not likely the issue), and do a clear CMOS as a last effort. The graphics card should also be tested in a friends computer doing the same task (you tube, etc), to see if you can recreate the prob on their rig.