Google has Launched Voice and Video Chat, Its inside inside Gmail

Today Google starts rolling out voice and video chat inside Gmail—which requires a free browser plug-in download. Also you will require a webcam and/or microphone. From Google Justin Uberti explains it as follows:

Once the plug-in is installed, for starting the video chat, go to the "Video & more" menu at the bottom of your google mail chat window, and simply choose "Start video chat." by clicking it. You'll have to wait for a few seconds to make sure you look presentable while it's ringing. Then you can see and hear your friend live, right from within Gmail chat/mail account. You can click the "pop-out" icon if you need the video in a larger window as required also you can choose the fullscreen icon from the upper-left corner for a full window experience.