The app requires you to have Google Account which can be created here.
Go to the marketplace and click to Install Google Hangouts Meet app:
Once installed, you can start inviting your leads to join video meetings with you.
You can simply invite customers to join a video meeting while you’re chatting to them. Just click the app icon in the Agent App Widget section, choose the Google Hangouts Meet app and Connect Google Calendar:
You’ll be asked to connect your Google Calendar to LiveChat. Once connected, you can start inviting your customers to join video meetings with you.
To invite your customer to join a video meeting just click the Start meeting button:
Once clicked, a meeting will be created in your Google Calendar and the invitation will be send to your customer:
You can now join the meeting by clicking on Join meeting from your app: