Pro Group video support
If you have signed in your Google account, Hangouts allows making video calls with up to 10 people or one-on-one. There are business, education and government solutions that increase the participant count to for video calls to 15 as well as offers support for those accounts.
Additionally, you can switch between using either the front-facing or rear-facing camera on your phone or tablet.
Pro Completely free
Google offers all features of Hangouts completely free. You can choose to pay for the business, education, and government solutions if you want to increase the participant count for video calls to 15 and get support.
A Google Voice account will be needed in order have a number that allows these calls to be made.