I have seen posts on the forum relating to issues with the camera on the S25 ultra. I have been on holiday and my camera has been glitching and clicking every time I used it to take pictures or video. I have shown exactly what it has been doing on this image below. This was just taking a photo but with motion sensor so it records three seconds. You can see that it clicks and blurrs. I have never had this problem with Samsung. From reading other people's comments, this must be a serious hardware problem.
Your video will take a while to show so right now I can't see it. Sounds like an issue with OIS/hardware camera stabilisation or with the focus system.
Not something I've personally experienced but since every s25 will be in warranty, I'd take it to a samsung store to have it fixed