$ sudo apt-get update
$ sudo apt-get install libavdevice53 

libavdevice53 is installed in your system.

Make ensure the libavdevice53 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libavdevice53 *

You will get with libavdevice53 package name, version, architecture and description in a table

libavdevice53 package basic information: