Android OS is a single user multitasking OS and has a lot of incredible features and advantages over other OS. Unfortunately, all mobile OS  can’t play Videos in background but here is a solution:
The solution is VLC Media Player, this media play is a well known one and has been around for years now and I know you don’t know it has this awesome feature.
Download VLC Media Player App
Download Here: Android
Download Here: iOS
Windows OS users can get it directly from store.
I guess the app is now ready.
Now navigate to the video you want to play using the Directories Tab.
When you find the video, long press on it then you’ll see a  new Tab, click on Play As Audio

How To Play Video As Audio On Mobile Using VLC
Finally, your video is now playing in background. 


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