Using YouTube on your web pages
While I can see that this may be attractive to many I am not so sure. If there is no other way that you can add video content to your pages, I guess that this could be a solution. I am not sure whether this looks very professional. Also, if you are a competent web designer I don't see why you would be struggling with video formats??
The use of YouTube video, in an iframe, is an easy way out - As is the use of iframes in general. I also have a concern that Google are less than useful unless you are a "customer". I was surprised looking at my server logs (actually awstats) that visits were way down since I abandoned Google Analytics.
The W3C example
Plays a muted Muppet video of Bohemian Rapsody muted and autoplayed.
The W3C website makes the following comment about autoplay (what the video above does)
The BWPC example
In this example I changed the link supplied to me that was a direct link to a YouTune page to include the /embed/ directory.
This technique obviates the need to create a thumbnail image for a iOS user to click on.
My Flying into Munt on YouTube