Live video interviews can be done in most modern web browsers. Supported browsers can be found here.
To do live video interviews on Internet Explorer, you need to install the OpenTok plugin first. For more information see this page: https://tokbox.com/developer/sdks/js/release-notes.html#requirements
Live video interviews are also possible using an Android tablet or smartphone device. The supported browsers here are Chrome and Firefox. You do not need to download the app to conduct your live video interview, instead use the mobile bowser.