Adjust One-to-Way webcam using WebRTC

I have a platform that is in development for transmission and chatting using a webcam. Currently, there is video traffic on both sides, but I need to block the visitor's audio/video and let only the model/representative of the site transmit the audio/video. Today we have 3 room types: Free Room that the model transmits audio/video and all the participants can see and hear the model, as well as write in the chat, but the model can not see or hear the visitors. Private room, in which the model and the visitor interact with one-to-one exclusivity. Room in the group, in this model and visitors, can talk and see all visitors, including the model, can also see and hear. The task: Leave the private room and the group room exactly the same as the free room. Skills WebRTC