Chrome package app access to media files

Question

I have google chrome package app.

I need to read locally saved photo and video and give them up to the HTML page.

How can I do this?

I try:

chrome.mediaGalleries.getMediaFileSystems(
  {interactive: 'no'},
  function(mediaFileSystems){
    mediaFileSystems.forEach(
      function(item, indx, arr){
        var mData = chrome.mediaGalleries.getMediaFileSystemMetadata(item);
        console.log(mData);
      });
  });

But console remains empty.