The camera will use more battery however it shouldn't be using that much even if the battery is not new.
Try clearing the cache in tbe camera app via Settings, Apps, Camera, Storage, Clear Cache.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.
Yeah i slightly have the same problem too. I took 4 photos and 1 video yesterday and some battery drained from the app. I thought Samsung's got a good battery.