i3DMovieCam

This app works on iPhone Xs, 11, and 12 with the 3D shooting feature. On other models, it is limited to recording video from a single camera.

You can shoot video/still images using the two side-by-side cameras on the back of the iPhone XS/11/12. On other models, it is limited to recording video from a single camera.
The two cameras have different angles of view, focal lengths, and f-stops, so don't expect too much, but you can enjoy 3D shooting at ease.

The recording function requires an in-app purchase, but all other functions are free.