1. Download the beta version of WhatsApp App. The version should be 2.16.318 or later.
2. Install the apk on your phone. [Don’t worry, you can install the app and it updates your existing app, your messages will not be deleted]
3. To make video calls, make sure the caller and the receiver installed the beta version of the App mentioned in step 1.
4. Open the contact and tap on the call button, now you will be promoted with two options Voice Call and Video Call.
5. Choose Video Call Option and the call begins.