How to set the "playback" icon on the thumbnail when reposting to social networks / instant messengers?

Question

Video

Hello, friends.
Tell me, please, I made a site (wordpress) for viral video content, but when reposting to social networks or messenger, a thumbnail is displayed without the "play" icon.
Tell me how to make a thumbnail with an artificial "play" icon.
Here's what my thumbnail looks like:

Here's how I want to do it:

Answer 1

The first thing that came to mind was the watermark.
I used this package .
You can try to set up a watermark setting rule not depending on the size, but on the referer of the image.
Those. if the picture is accessed from another site, then set a watermark on the image (in this case, the playback icon)