What are the services for broadcasting video from the monitor screen via the web interface?

Question

Screencasts

It is necessary at a certain time to conduct a video broadcast showing what I have on the monitor. And users should be able to view through the web interface directly in the browser without installing additional. Software and unnecessary gestures. The service is only looking for free.
Or maybe there is a driver in nature that will capture the video stream from the screen and redirect it to the virtual webcam driver so that you can use YouTube live broadcasts in the service, because. it suits me the most, but it only supports webcams

Answer 1

Consider the OBS software in Bundles with any streaming service, such as YouTube

Answer 2

You need to install screen capture software and use one of the streaming services:
youtube.ru
twitch.tv
justin.tv
cisco webex seems to be free to use for a while.
for a detailed manual search in google "how to stream"