Fallback not showing on newer Iphones

Go to SETTINGS - ADVANCED - INSERT CODE

Insert this code in the FOOTER block:

<script type="text/javascript">
(function(){

  // Custom script to load the fallback image of a video in the background while loading

  var startObserver = function(sqsVideoEl){

    var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
    if (!MutationObserver){
      return;
    }

    var getPlayerElement = function () {
      // the element changes from div to iframe during runtime, id is the same though.
      return sqsVideoEl.querySelector('#player');
    }

    var fallbackImageElement = sqsVideoEl.querySelector('.custom-fallback-image');

    var isVideoReady = function(){
      return sqsVideoEl.querySelector('#player.ready');
    }

    var observer = new MutationObserver(function(mutations) {
      mutations.forEach(function(mutation) {
        if (isVideoReady()) {
          observer.disconnect();
          getPlayerElement().style.opacity = 1.0;
          fallbackImageElement.style.display = "none";
        }
      });
    });

    var isIframeLoaded = function (){
      if (!sqsVideoEl.querySelector('iframe#player')) {
        setTimeout(isIframeLoaded, 150)
      } else {
        observer.observe(getPlayerElement(), { attributes : true });
      }
    }

    if(!isVideoReady()){
      getPlayerElement().style.opacity = 0.0;
      fallbackImageElement.style.opacity = 1.0;
      fallbackImageElement.style.display = "block";
      isIframeLoaded();
    }
  }

  var init = function(){
    // As there can be multiple background video's on a single page we do this for all of them in a loop.
    var items = document.getElementsByClassName('sqs-video-background');
    var items_len = items.length;
    for (var i = 0; i < items_len; i++) {
      var el = items[i];
      startObserver(el);
    }
  }
  try{
    init();
  }catch(err){
    if (console && console.error){
      console.error('Error while trying to load fallback images by default (manual code injection script in Settings > Advanced):', err);
    }
  }

})()

</script>