For playing back up video footage, you can use VMS-6100. It has a preloaded video player. You can go to File Center and click Local Files. Brows the directory contains the backup files. Double-click the file you want to playback. Download VMS-6100 from below link.

https://www.jovisionsecurity.com/download.html

Or

You can use PotPlayer it can playback almost all the video types. Check the link below.

http://potplayer.tv/