How can I have a video chat on my site like Gmail? [closed]
I don't think this can be done with PHP because the application which gets your Webcam's videostream must run on the Client, not on the Server. In this case, if you don't want your users to install special Software on their machines, you'll want to do it with Flash or a Java Applet.
I also found a library which uses AJAX and REST to do it.
Native browser support enabled via Javascript APIs is under development and supported by Google, Mozilla, and Opera. The project is called WebRTC (Web Real-Time Communications) and is supported in Chrome.