guifi.TV

go here for better format:
https://github.com/pedro-nonfree/guifi-tools-and-scripts/blob/master/guifitv/README.md

Screen capture of speaker
Mix speaker's screen with video camera source and do a standard streaming.

Mixer software: Open Broadcaster Software

MJPEG

Obs configuration: add source Media Source unset local file, input url (http:// or udp://) and input format mjpeg.

Pros

Low latency
Low cpu usage
Cons

High bandwidth usage. For a semistatic content, requires 20 Mbps.
VLC client (http - passive)

Debian 8 Jessie with by default VLC apt-get install vlc: cvlc -vvv --no-audio screen:// --screen-fps 4 --sout "#transcode{vcodec=MJPG,vb=15000,scale=1}:standard{access=http,mux=mpjpeg,dst=:18223/}"

A more cleaner way (not tested): cvlc -vvv screen:// --sout "#transcode{vcodec=MJPG,vb=15000,scale=1,acodec=none,fps=4}:standard{access=http,mux=mpjpeg,dst=:18223/}"

Windows 7 with VLC 2.1.4 Ricewind

disable firewall or make an exception for VLC
cd "Program Files\VideoLAN\VLC"
vlc.exe --no-audio screen:// --screen-fps 4 --sout "#transcode{vcodec=MJPG,vb=15000,scale=1}:standard{access=http,mux=mpjpeg,dst=:18223/}"
MacOS (not tested)

Known issues: I do not know how to make the mouse pointer appear
avconv client (rtp - active)

Debian 8 Jessie stable with just apt-get install libav-tools: avconv -f x11grab -r 10 -s 1024x768 -i :0.0 -f mjpeg -q 1 udp://${obs_url}:${random_port}