If a client publishes audio/video and no longer has the video permission,
the whole publisher will be closed. Previously this was only checking
the generic "media" permission.
- Individually for each backend.
- For the proxy client (i.e. signaling server using cluster of proxies).
- For the proxy server / MCU.
The smallest bandwidth configured will be used, e.g. if a backend has a
larger limit than the MCU assigned for the stream, the limit of the MCU
server will be used.