Youtube background video from CMS

Hi, I am trying to embed a background video from the CMS on the header in individual blog posts. What I have done so far is added a video field to the CMS (all videos are hosted on YouTube), and placed my url there. On the blog post page, I have linked a video element to the CMS field.

Everything works fine, but I can’t seem to get the video to mute or loop. I have tried adding parameters and the ?autoplay=1 works, but &loop=1 or mute=1 just don’t affect the playback at all. Does anybody know why?

Here is my public share link: LINK
(how to access public share link)