gem-plugin-v4l2 software package provides Graphics Environment for Multimedia - V4L2 output support, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gem-plugin-v4l2
gem-plugin-v4l2 is installed in your system.
Make ensure the gem-plugin-v4l2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gem-plugin-v4l2 *
You will get with gem-plugin-v4l2 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Graphics |
| Package | gem-plugin-v4l2 |
| Version | 1:0.93.3-10+b2 |
| Description | Graphics Environment for Multimedia - V4L2 output support |
| Sub Section | Graphics |
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