Can gnome’s cheese rotate the video of camera?
I don’t think so. Also, if not, it will probably not be added. Since Cheese is being replaced by the new Snapshot app (using GTK4 and libadwaita).
Can you explain why you need this feature ?
Because sometimes I use my computer as a camera to capture some pictures like a mobile. A mobile can rotate its camera automatically.
Cheese is no longer actively maintained. GNOME Snapshot is the new official camera app, which replaces Cheese.
You can open a feature request at https://gitlab.gnome.org/GNOME/snapshot/-/issues/
Prior to that, you might want to look at https://gitlab.gnome.org/GNOME/snapshot/-/issues/10