Install OBS

• sudo apt install ffmpeg
• sudo add-apt-repository ppa:obsproject/obs-studio
• sudo apt update
• sudo apt install obs-studio

VIDEO

• Down load and install v4l2 sink
• sudo apt-get install v4l2loopback-dkms
  

Run v4l2 loopback

• sudo modprobe v4l2loopback devices=1

See where the Dummy video is running to

• v4l2-ctl –list-device

Open OBS
goto the Tool puldown and open v4l2 and set the the path

SOUND

• pactl load-module module-null-sink sink_name=Virtual-Speaker sink_properties=device.description=Virtual-Speak
• pactl load-module module-remap-source source_name=Remap-Source master=Virtual-Speaker.monitor

Now in OBS in the setting Audio-Advanced Monitoring Device to Virtual-speaker

In Zoom
For the video set to Dummy
For the Sound set to Remap Virtual-Speaker