The code of the 'Video MyCode Templates' of the theme are not correct.
For youtube (video_youtube_embed) it has to be changed:
<iframe class="iframe_video" src="http://www.youtube.com/embed/{$id}" frameborder="0" allowfullscreen></iframe>
to
<iframe width="560" height="315" src="//www.youtube.com/embed/{$id}" frameborder="0" allowfullscreen></iframe>
The same issue seems to be in other Video Templates, too..., like vimeo
For youtube (video_youtube_embed) it has to be changed:
<iframe class="iframe_video" src="http://www.youtube.com/embed/{$id}" frameborder="0" allowfullscreen></iframe>
to
<iframe width="560" height="315" src="//www.youtube.com/embed/{$id}" frameborder="0" allowfullscreen></iframe>
The same issue seems to be in other Video Templates, too..., like vimeo