Visitors to the demo URL can initiate video calls with anyone else who has also navigated to the same URL simply by clicking the 'call' buttons.
demo URL:
https://raw.githack.com/jay23606/p2p-webcams/main/index.htm
This is done using firebase to add/remove the peer IDs and peerJS for peer-to-peer communication.
You can test it out by opening multiple tabs. To end a call just click the video.