The latest beta for Android shows an option to video call whenever you try to call someone. Unfortunately, as of now it seems the feature is not enabled to all users, with some getting the ‘Video Calling is unavailable at this time’ error message, however, some other users are reporting using it.
The feature is currently in testing phase then, and it probably won’t be too long before we see it being enabled for everyone across platforms.
Looks like this new feature needs to be activated from the server side, which might happen soon. This could roll out gradually, similar to the voice call that was initially available only for some users through invite, later it started rolling out for everyone.
WhatsApp is also said to be working on ‘send group invites via links, QR codes and NFC tags’.