After clicking on the Video call button on the chat window, your free video call will be established with your friend using iPhone.
Infotech
Nimbuzz is the free call and messaging application for mobile devices. Now a new service has also been introduced by them that lets you video call from iPhone or iPad (using iPhone app) to Windows PC. This means you would be able to do free video calling between iPhone and PC after installing the app on both the devices. This video calling feature works over 3G/4G and WiFi. Using it you can always stay connected with your loved ones. For video calling, you and your Nimbuzz are both required to have the newest version of this app installed.
You have the ability of using either of the cameras, the front or the back, on your iPhone or iPad. If you want to set up video chat from iPhone to PC or the other way round, all you have to do is to download the apps for the respective platforms.
Note: No iPad app from Nimbuzz is available, but you can always use the iPhone app as it works fine.