gem-plugin-v4l2-dbgsym 1:0.93.3-9build1 (armhf binary) in ubuntu xenial

 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.