I don’t have a video, but I am doing the bajillion blades of grass (nanite) and over time and I get splotches between the blades, more pronounced if I use screen-scaling. It seems similar to what I am seeing in your video, when the leaves/branches bend, sometimes they get a bit darker than they used to be a second before. Particularly the on just top-left of center-screen.
I used r.TSR.History.SampleCount 32 to help address the issue. Not perfect in my case but noticeably better. Hopefully it helps you.
For ref:
In my case, DLSS seems to offer pixel-perfect screens even at 50% resolution (r.screenpercentage 50); it’s literal voodoo