Install gem-plugin-v4l2 by entering the following commands in the terminal:
sudo apt update sudo apt install gem-plugin-v4l2
Description:
Graphics Environment for Multimedia - V4L2 output support
Gem is a loadable library for Pure Data (Pd), which adds OpenGL graphics rendering and animation to Pd. Pd is a graphical programming language and computer music system. . This package provides video input and output using V4L2. . For video output, you might want to use a loopback device, for which you will have to install the v4l2loopback kernel module as well.
Homepage: https://gem.iem.at/
Version: 1:0.93.3-13
Section: universe/graphics