Open iFrame within a map

What's the easiest way to open an iframe inside a map? We have a bunch of videos of assets stored in our content management system and I'd like to have the video open within the viewer. I've already got the arguments figured out of how to call the video (build the URL), although for now I'll probably just have it open to google or something simple. I'm just not sure how to start with having an iframe open. 

 

 

Any advise, tips, or other would be greatly appreciated! 

 

 

Thanks!