The rings though look manmade, like they're markers for something. Also, these may not be in the same place but rather scattered all around Paldea. They could maybe have to do with one of the Treasure Hunt quests, if I had to guess the one concerning the Professors' research. If so, if there are in all one place it could be part of a puzzle to solve to accomplish a specific "task", but if the marks are all around Paldea as I think (the colors and patterns meant to be representative of that "segment" of Paldea) they may simply be an easy "over here player" marker to find what the player should be looking for (that way they could hide the thing in a more hidden location for a more dynamic cutscene but without making it too hard for the player).
Even then. I'm sorry if it sounds selfish but they needed more happening cause in total, if we take every single instance a Pokemon showed up, there was only a little over
7 minutes of content. That's not being respective of the customer's time. Like, they really should have something going on every 30 minutes or so, even if its just a Pokemon walking past the camera. Heck, maybe even have something happen to the camera which causes issue with the video (it gets knocked over or the angle gets changed, a Pokemon releases a cloud of dust/powder which lingers for a while, something is put in front of the camera/a Pokemon sleeps directly in front of it, etc.), which is of course then you have Galarian Ponyta appear, before 30 minutes later it gets fixed (maybe having Sonia appear in view one once or twice checking to see if the feed is still going). They could even have little stories going on.
"Pika#s, this was just supposed to be a quick thing they threw together to just reveal G-Ponyta". Yeah, well, as
Project_Mars said, neat concept but poor execution, and unless they want to put effort into it I wouldn't suggest it again or they change something like, instead of a long stream, have it be a motion camera and it only turns on when something is happening. That way its easy to go back to for those who just check in now and again, and also they could have the official Pokemon Twitter be a part of it notifying everyone "the motion tracker camera has been turned on".
So,
here's the Wikipedia page for the Oma Forest and, while not big, has this interesting tidbit: "
The projects aims to display the horrible and ghastly harmony between nature and human presence by painting on the trunks of trees, human figures, animals and geometric shapes, some of which are visible only from certain positions". Hmm.