Making a video call is just like making an audio call where you simply open a call chat with the person you want to contact and then select the Video Call option. The other person, for now, will also need to have video calling for it to work otherwise you'll get an error message.
With a simple tap on the screen, you can access your messages, for example within the application, or return to the menu and use your smartphone for other purposes while continuing your call. Of course, if you do not keep the display of the call on the screen you can not see the caller but only hear the audio. To see him/her again, simply reopen the window.
You can download the latest version of WhatsApp version 2.16.318 here. But remain patient, the feature is rolling out to all users (not just beta users anymore) in the coming days. Uninstalling and reinstalling the app or clearing the cache won't do you any good. You just have to wait.
When WhatsApp finally got a voice calling feature last year it left us with just one question: when do we get video? Well, now it's underway. According to the WhatsApp blog, the feature is gradually rolling out for all users across the various platforms in the coming days.