Video header not playing anywhere

Hello guys. I'm having a hardtime using a video as a header media for my website. First, it was playing on desktop environment and not on mobile devices. Later on, I tried activating breadcrumb and installing Header Enhancement, but the problem still persists and was showing intermittent positive results. Later on, the video stopped playing at all and the play/pause button did nothing. Now the problem is getting worse. The homepage only shows the static first still of the video, the play button does nothing and I have intermittent problems with the homepage not showing at all. This is my website: http://www.infinityfilmes.com.br/