Install the IP Webcam Android app. Likely works with others and in iOS as well.
Load the v4l2loopback module (install it in case it's not already available on your system):
modprobe v4l2loopback devices=1 video_nr=2 exclusive_caps=1 max_buffers=2
Connect the phone to USB of the desktop. Enable tethering in Settings ->
Connections. Take a note of the address on the new default route added to your system. Remove the