The announcement was made today by Google software engineer Victoria Kirst, who stated:
Starting today, we're rolling out an update that makes it easier than ever to start Hangouts video calls with your family and friends! You'll now be able to launch Hangouts in Chrome without having to download and install a plugin. Just click to start the Hangout, allow Hangouts to use your camera and microphone, and you'll be good to go!Before you get too excited, Kirst does add that this feature is currently available just for Chrome Dev and Canary users but that it will be rolled out to all Chrome browser owners "over the next few weeks."
[Source: Android Central]