Anybody can share their webcam in the meeting. No special permission is needed.
To share your webcam:
On the meeting controls, tap the Webcam button.
Your front-facing camera displays in the room on the Meeting tab and the Webcam button turns blue to indicate you are sharing.
Note: On iOS, you can view and share webcams on Wi-Fi or your carrier's cellular network; on Android, only Wi-Fi is supported. You can't preview your webcam on mobile.
To stop sharing, tap the Webcam button again.