$ sudo apt-get update
$ sudo apt-get install mjpegtools-gtk 

mjpegtools-gtk is installed in your system.

Make ensure the mjpegtools-gtk package were installed using the commands given below,

$ sudo dpkg-query -l | grep mjpegtools-gtk *

You will get with mjpegtools-gtk package name, version, architecture and description in a table

mjpegtools-gtk package basic information: