Is there any way to enable adding short videos in photo gallery of product?
Please, have a look at our Video manager add-on.
This add-on allows you to put videos in blocks on any CS-Cart page and in a Video tab on a product details page. Here is the demo for a product details page http://demo.alt-team.com/4_demo/index.php?dispatch=products.view&product_id=80 (click the Video tab).
Probably, it will suit your needs.
Best regards, Alt-team