Webamator

YouTube iframe embeds often load many unnecessary resources, which slows down your page. YEP: Optimize YouTube Embeds is a lightweight WordPress plugin that replaces YouTube iframes with a clickable preview image. 
The actual video loads only when the user clicks the play button, improving page load times and reducing initial page size.
<h3>External services</h3>
This plugin uses the external YouTube thumbnail service (https://i.ytimg.com) to display preview images of YouTube videos. 
When a page with a YouTube embed is loaded, the plugin requests the thumbnail image directly from YouTube servers. 
No personal data is sent from your site to YouTube, only the video ID (already public in the YouTube URL).
Privacy Policy: https://policies.google.com/privacy 
Terms of Service: https://www.youtube.com/t/terms

YEP: Optimize YouTube Embeds

Short Description: Load YouTube videos faster by replacing iframes with a preview image; the video plays only when clicked play.

John Antonacci

Creates styled grids in WordPress pages/post/sidebars from YouTube Playlists. Also, displays single YouTube videos from video id. All videos displayed through plugin block or shortcode (grids and single) include schema.org metadata markup as recommended by google.
Requires YouTube Data API key – Instructions for getting the api can be found in the installation tab. 
Block display for WordPress version 5+
Shortcode examples: 
single videos 
[yt_video_wrap width=”100%” alignment=”none”]url here[/yt_video_wrap] 
[yt_video video_id=”your_yt_video_id” width=”100%” alignment=”none”] 
notice the optional width and alignment attributes above – just used to make simple positioning easier. 
lists 
[yt_grid yt_list_id=”your_yt_list_id”] 
Display attributes can be used to overwrite the plugin settings on a list by list basis (^indicates can be applied to grids only). 
item_font_color – the color of the h3 title 
item_font_size – title size in px 
item_font_alignment – left, right, center 
item_font_length – number of characters from title to display (will round down to nearest word) 
item_bg – background color 
item_border – border color 
^query_max – maximum number of videos to display 
^query_offset – offset query at beginning by this value 
^item_gutter – horizontal spacing (even # between 0 and 30 recommended) 
^item_spacing – vertical spacing 
button_font – for expansion buttons on upper left of items (the arrow color) 
button_bg – for expansion buttons on upper left of items (bg) 
^Columns – if you use and column attribute in the shortcode ALL plugin settings will be ignored and just shortcode values will be used. This was done on the assumption that if you want to take control of the column display of a particular list you should take complete control. 
lg_cols – 1200+ 
md_cols – 992+ 
sm_cols – 768+ 
xs_cols – 768- 
additionally the id, class and style attributes are also available and will have the same syntax and behavior as in html.

YouTube Playlists with Schema

Blocks or shortcode for embed of responsive single videos and grids from YouTube video playlists, which include schema.org markup as recommended by go …

YEP: Optimize YouTube Embeds vs YouTube Playlists with Schema