Defer Media is a plugin for speed up your website and defer not needed medias which out of the screen when page loaded. Then, when you scroll down the page, it will load images/videos/iframes automatically or pre-load it even if it it not visible yet (can be adjusted with Appearance Offset parameters).
This plugin will apply the following actions: – Defer images (standard [img] tag and also [picture] src sets) – Defer background images (if style=”background-image” applied for some block) – Defer Videos ([video], [source] tags) – Defer Youtube embedded videos (iframe) – Defer any Iframes ([iframe] tag)
You can see plugin demo on this page: Defer Media demo