How can a simple web application communicate with jicofo?

Hello all I know this question is of very much rookie level but I wanted to know how can a web client communicate with jicofo through xmpp I mean I did see the steps to do in one of the post
Link : How Jitsi work

But I did search a lot, there are no examples for the same on how to do the same.

If anyone is knowing how can we start off with this please suggest some steps and example which I can use as an reference.

Thanks You