Hi there,
the Theme doesn’t control this kind of thing.
It really depends on what video player is added to your page, and how that player can be interacted with using Javascript.
The example you provided uses the HTML Video element to display its videos:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video
If you were to use a HTML block to add the <video>
then you can use the method here:
https://stackoverflow.com/a/44398411
Which will play / pause the video when hovered over.
NOTE: I am not sure how Mobile devices will handle this, they in theory should play on tap.