vkPinnedVideo.js

cur.pinnedVideo = '-460389_160321403';
cur.pinnedVideoInitHandlers = function() {
  var post = ge('post-34371983_6');
  var playerEl = ge('video_player') || ge('html5_player');
  if (post && playerEl && isAncestor(playerEl, post)) {
    addEvent(window, 'scroll', cur.pinnedVideoScrollHandler);
    cur.destroy.push(cur.pinnedVideoDestroyHandlers);
    cur.pinnedVideoScrollHandler();
  }
  delete cur.pinnedVideoInitHandlers;
};

cur.pinnedVideoScrollHandler = function(evt) {
  var post = ge('post-34371983_6');
  var playerEl = ge('video_player') || ge('html5_player');
  var playerObj = ge('video_player') || window.html5video;
  if (!post || !playerEl || !isAncestor(playerEl, post) || (playerObj.isTouchedByUser && playerObj.isTouchedByUser())) {
    cur.pinnedVideoDestroyHandlers();
    return;
  }

  var playerY = getXY(playerEl)[1];
  var playerHeight = getSize(playerEl)[1];
  var scrollY = scrollGetY();
  var viewportHeight = window.innerHeight || document.documentElement.clientHeight;

  var inViewport = (playerY + playerHeight/2 > scrollY) && (playerY + playerHeight/2 < scrollY + viewportHeight);

  if (inViewport != cur.pinnedVideoPrevInViewport) {
    window.Videoview && Videoview.togglePlay(inViewport);
    cur.pinnedVideoPrevInViewport = inViewport;
  }
};

cur.pinnedVideoDestroyHandlers = function() {
  removeEvent(window, 'scroll', cur.pinnedVideoScrollHandler);
  delete cur.pinnedVideo;
  delete cur.pinnedVideoScrollHandler;
  delete cur.pinnedVideoDestroyHandlers;
  delete cur.pinnedVideoPrevInViewport;
};

var startVideo = function() {
  if (browser.mobile || window.mvcur && mvcur.mvShown) return;
  var post = ge('post-34371983_6');
  var column = geByClass1('page_post_queue_narrow', post);
  var thumb = geByClass1('page_post_thumb_video', column);
  if (!post || !column || !thumb) return;

  showInlineVideo('-460389_160321403', 'ef6a8de6ea035e445a', {autoplay: 1, addParams: { post_id: '-34371983_6', mute: 1 }}, null, thumb);
};

if (vk.loaded) {
  startVideo();
} else {
  addEvent(window, 'DOMContentLoaded', startVideo);
}