Ever heard of making live calls inside the browser without any plugins installed, well there is new protocol known as WebRTC (Web Real-Time Communication) in which you can video chat, send files, VOIP(voice over internet protocol), chat with friends on real time basis and all these for free. Note that this is new standard of innovation laid down by W3C and currently works for Google Chrome and Firefox browser only and yes it does support the Opera browser.
The developers used a sample app from Github to demonstrate in-browser video chat. They used a beta of Chrome 25 and a Firefox nightly build. However, users at both the ends need to grant permissions to activate cameras and microphones. With WebRTC, we can expect to get click-to-chat features in web pages.
This is simple video showing demonstration of how real time video communication is done using WebRtc
The video below would explain us better about WebRtc (by Google Developers)
Note that the audio and video quality is excellent and WebRtc uses secure connection between the browsers (AES 128 or 256 bit encryption) depending on the pc architecture.