Is there any Tag like ALT Tag for Image for SEO Purposes in IFRAME

When we are embedding you tube website in our site we get code from you tube which look's like this :

<iframe width="560" height="315" src="//www.youtube.com/embed/AYxrpBFTK6g" frameborder="0" allowfullscreen></iframe>

My question is : is there any way to tag this video which is used for seo purpose.

Like we apply alt tag for image for seo purpose.