Selecting Dual Camera and choosing the video layout
Currently, only the Meetings app for iOS supports dual camera. Your iOS device must be on iOS 12 or later and have an A12 or later processor to support capturing multiple cameras simultaneously.
1

Tap Camera Camera icon.

2

Toggle Dual Camera on.

By default, your back and front camera video appears side-by-side.
3

(Optional) Tap the side-by-side icon to change your dual camera video layout to picture-in-picture.

Your front camera appears as a smaller video within the larger video of your back camera.
4

Tap Start My Video.