How to create a video call function on the site?

Question

PHP

how to create a video call function on the site, give links to useful material and what language is best to write

Answer 1

Handbook and WIKI .
Articles:
Making Your Own Skype
WebRTC #1 - Getting Acquainted

Answer 2

peerjs.com

Answer 3

WebRTC
JavaScript SIP library

Answer 4

If the client should not install anything, then
tokbox dimdim
If
you can install something, then raise Jabber on your server. Still there is ConferenceXP.
And besides:
Adobe Connect
GoToMeeting
Here is another search that gives normal results: video calling on the site