Set up WebRTC with js

Hello! I want to create a video conferencing system where people can chat one-on-one (not multiple!). I want to follow this tutorial: [login to view URL] This video however is rather old. In the comments, the author says that this is his current approach: [login to view URL] So I want to use this instead! I would like you to set this up on a server and show me how 2 people can video conference with each other. I want to extend this later on a make a database to create video conference appointments, so this is only the first step. Thank you.