I don’t play (or even watch) video games, but here is something I’ve noticed:
I watch videos on YouTube occasionally. Sometimes they have rapid action. Likewise I go to movies now and then (e.g., Star Warts) and they have fast action scenes. These fast-action scenes in videos and movies can be a bit blurry, especially the backgrounds or other parts of the scene that aren’t really the focus of the action.
I find that those fast-moving somewhat-blurry backgrounds can be a bit dizzifying.
If you’re riding roller coasters, bobsledding, or anything like that, you can focus your eyes on any part of the scene you like, and actually focus rather than letting all that background become a crazy blur. I think that makes the difference between getting dizzy and disoriented, versus not.
My personal experience comes from flying sailplanes, which regularly entails flying in steep tight circles for, possibly, many minutes at a time. Pilots are regularly taught to look out into the distance, towards the horizon, and NOT to look at nearby stuff much, and especially not to look longer than brief glances at things inside the cockpit. (When I was learning to drive, we also learned to “aim high in steering”, meaning to look far ahead down the road.) I’ve found that, when one wing is pointed down at the ground, it’s dizzifying to look down at the ground past the wing-tip – it’s like looking down from the top of a very tall building. Looking up into the sky past the other wing-tip has a similar effect.
And it’s important not only to look out at things toward the horizon, but to actually focus your eyes on things and not let it all become a blur (as it might when you’re flying in tight circles). My instructor, some years ago, made an explicit point of that one day when we did spin training. (Here’s a video of what spin training in a glider looks like. No, that’s not me in this video.) I was taught, very explicitly, to look out into the distance and focus on the things I see, and NOT let it all just become a blur. We went out over the middle of San Francisco Bay to do this, and he had me call out loud the names of the cities around the edge of the bay as they came around. That was all specifically to prevent becoming dizzy and disoriented.
When you watch action videos or games and stuff in the background scenery just blends into a blur, I suspect that’s what makes it disorienting.