In the Messenger’s latest update, this new update is rolled out and up to six people can video call at a time. Getting into a group video call is really easy and all you have to do is start a new group or join an existing group and then tap on the video camera icon that is on upper right hand of the app. All the members of the group chat will be notified and up to 6 people can join this video call.
In a group chat up to 50 members can join but in the video call, only 6 people can join at a time. All the members of the group chat will be notified about the group call but at max 6 people can join this group video call.
The group calling also has the feature of Selfie Masks which will allow the users to disguise themselves. The group calling feature is available on the web, iOS, and Android in the latest version of the messenger and to make a group call, all the members must have the latest version of the Messenger.[Source: Facebook]