So, 2 things are used for this problem.
First, the following line is added to config.xml
<preference name="AllowInlineMediaPlayback" value="true"/>
And after adding the webkit-playinginline directive inside the video tag, like this:
<video controls preload="auto" webkit-playsinline><source src="videos/video_file.mp4"></video>
And it works like a charm.
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