UserAgent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Example URL:
https://www.kamennakamen.cz/

Steps to reproduce the problem:
1. Open website https://www.kamennakamen.cz/
2. Video not loaded automatically
3. 

What is the expected behavior?
Autoplay of video on homepage of https://www.kamennakamen.cz/

What went wrong?
Video should be loaded and played automatically but is not.

Did this work before? Yes Do not know the version, but 1-2 weeks before, it worked well.

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? Yes

Chrome version: 68.0.3440.106  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

Contents of chrome://gpu: