Google has added “voice and video chat” right inside Gmail for PCs and Macs. All you have to do is download and install the voice and video plugin for easy-to-use, seamless experience, with high-quality audio and video, which’s designed using Internet standards such as XMPP, RTP, and H.264, which means that third-party applications and networks can choose to interoperate with Gmail voice and video chat.
Once you install the plugin, to start a video chat, just click on the "Video & more" menu at the bottom of your Gmail chat window, and choose "Start video chat." You'll have a few seconds to make sure you look presentable while it's ringing, and then you'll see and hear your friend live, right from within Gmail. You can click the "pop-out" iconto make the video larger, or click the fullscreen iconin the upper left-hand corner for a fully immersive experience.
See this all in action in the video below: