I've placed "Spacers" to center the video above. I didn't have any luck with centering the video below. I would need to refresh my coding knowledge to correct that, but someone on your team may be more experienced in that than I. 

The embed code for above is:

<iframe type="text/html" frameborder="0" width="480" height="394" src="//video.nest.com/embedded/live/lI8xuIaN3U?autoplay=1"></iframe>
<p>Hello, World!</p>

The embed code for below is: 
<iframe type="text/html" frameborder="0" width="1280" height="720" src="//video.nest.com/embedded/live/lI8xuIaN3U?autoplay=1"></iframe>