Unfortunately this is not possible from the standard options provided,
However if you have have a basic understanding of HTML, CSS & JS you can fairly easily implement this onto your page through the "+ More - HTML" option within the Gridder -
Alternatively you can use "Custom CSS & HTML" in "Lay Options"
Adding a Video through Custom Code:
With this option you have much more flexibility over how you control the video along with options to add a loading Gif:
For more information regarding CSS:
Also if using jQuery, to replace the shorthand symbol '$' to 'jQuery'
If this becomes too problematic you may wish to seek the aid of a developer.
I once again apologise that the option isn't as easy and that i cannot help further with Customisation,
however if you have any further questions please feel free to ask :)
Best Wishes and thank you for using Lay Theme