With Google hangouts, communicating and collaborating amongst a group of people is easy and does not require the setting up of video conferencing equipment.
Hangouts enables you to have video chats with two or more people in your circle.
Google Hangouts Tips and Tricks
Using keyboard shortcuts
You can make instantaneous actions through your keyboard when on a video call. It is possible to mute/un-mute the microphone. You can turn your webcam on/off and open chat among many more actions. All you have to do is type a question mark in a video hangout to view the available shortcuts.