you can reach to this if you check the lower right corner and you will see a chat messenger.
Then click on the name of your friend that you want to video call.
That call is 100% private between you and your friend.
Admins and moderators have no access to this 1-on-1 Video call.
Another way to have a 100% private 1-on-1 video call is by going to your friend's profile, then you scroll all the way down to the left bottom corner. You will see an icon for a video call.
To use this type of 1-on-1 video calls your account has to be upgraded.
