Google added the functionality to share your screen with Google AdWords support representation in April this year. It has now announced to add video calls based on the same technology it uses for Google+ Hangouts.
The announcement was made in the Google AdWords Help community. The assistance can be availed during support hours by logging into AdWords account and clicking on the Help section on the top right of the page. The "Video Call" options will be visible under Contact Us menu.
When you select the Video Call menu, a new window will open up the way it appears in Google Hangouts.Google Adds Video Call Support to AdWords!,