DroidCam

DroidCam turns your phone/tablet into a webcam for your PC. Use
 it with chat programs like Zoom, MS Teams, and Skype.

Main Features:
– Chat using “DroidCam Webcam” on your computer, including Sound 
and Picture.
– Connect over WiFi or USB cable.
– Unlimited free usage with standard definition.
– Keep using your phone while DroidCam is in background (Android).
– Simple, safe, efficient, and trusted by millions of people 
worldwide.

The GNU/Linux client is a combination an executable app that 
connects to the phone, and Video4Linux and ALSA loopback drivers.

It’s assumed you are somewhat familiar with the system and how to 
use the Terminal. Please keep in mind other posts on the site are 
Windows oriented.