Video not showing in certain browsers

Community resources General
1

Hi,
I have a background video elemenent in my hero section. However it is not playing in certain browsers. Does anybody have a clue how to fix it? Or is it a Webflow bug error?
Thank you for help
Lucie

https://www.cistenikobercu-ricany.cz/

2

Please attach the screenshot or share read-only link for your Webflow project

3

Thank you. The link is here:
https://preview.webflow.com/preview/jans-website-11?utm_medium=preview_link&utm_source=designer&utm_content=jans-website-11&preview=9c0d41d15300cbccad163729648a23e5&workflow=preview