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$("video").prop('muted', true);

$("#mute-video").click( function (){
  if( $("video").prop('muted') ) {
    $("video").prop('muted', false);
  } else {
    $("video").prop('muted', true);
  }
});

if(isMobileDevice===false && /chrom(e|ium)/.test(navigator.userAgent.toLowerCase())){
  $("#mute-video").trigger('click');
}

<button id="mute-video">Toggle Mute</button>

<video controls class="cz"> 
  <source src=http://techslides.com/demos/sample-videos/small.webm type=video/webm> 
  <source src=http://techslides.com/demos/sample-videos/small.ogv type=video/ogg> 
  <source src=http://techslides.com/demos/sample-videos/small.mp4 type=video/mp4>
</video>