This feature allows you to make a group call with up to four participants at the same time.
In other words, only four people can be on the group video call simultaneously.
Currently, users make over 2 billion minutes of video and audio calls through WhatsApp every day.
you might follow the below steps if you want to make a video call.
The app allows to add only one person at a time.
Currently, Facebook Messenger supports group video calls of up to 50, while Snapchat supports 16 participants.
Source:WhatsApp
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source: www.techworm.net