ScanImage 2016 : Howto Embed a Youtube video

Embedded Youtube Video
Error rendering macro 'html' : Notify your Confluence administrator that "Bob Swift Atlassian Add-ons - HTML" requires a valid license. Reason: VERSION_MISMATCH
Embed youtube video in HTML Macro
<center><iframe width="574" height="454" src="" frameborder="0" allowfullscreen></iframe></center>

If loop=1, playlist has to be set to the youtube video id.