> I looked a Flash: but of course it's not desirable to use it these days.

RTMP protocol has a lot of implementations and is still widely used for the backend part of transmitting video at a low latency (i.e. from the recorder to the server).

RTSP with or without interleaved stream is another option.

DASH/HLS is a solution for worldwide CDN delivery and browser based rendering. Poorly suited for low latency.

If you need low latency and browser based rendering you need something custom.