use aframe v0.6.0 <script src="https://aframe.io/releases/0.6.0/aframe.min.js"></script>
use ar.js v1.5.5 <script src="https://cdn.rawgit.com/jeromeetienne/AR.js/1.5.5/aframe/build/aframe-ar.js"></script>
use link to .patt file on a hosted server <a-marker-camera preset="custom" type="pattern" url="https://raw.githubusercontent.com/alexxss/custom-marker/master/marker.patt"></a-marker-camera>
Using animated gltf:
use aframe extras <script src="https://cdn.rawgit.com/donmccurdy/aframe-extras/v4.0.2/dist/aframe-extras.min.js"></script>