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Thanks for contacting the Wowza Community
Here is a link to our video chat option out-the-box. Video Chat.
Other options for multi-user chat, you will need to develop the backend that controls the viewing and communication. Wowza can power that backend streaming for that via multiple protocols like RTMP, RTSP, HLS, WebRTC.
Hope this helps. If any further questions, feel free to contact us.