[GNOME] Add option to hide camera preview for video calls
Please add an option to show/hide camera preview when continue sending outgoing video.
https://git.ring.cx/savoirfairelinux/ring-client-ios/issues/13
https://git.ring.cx/savoirfairelinux/ring-client-gnome/issues/818
https://git.ring.cx/savoirfairelinux/ring-project/issues/473
Thank you