Andr&eacute; Boekhorst

The Live Video Annotation plugin allows you to add timed footnotes to a YouTube video while you are watching the video. Visitors can see these notes later while watching the video. It’s really easy to use and the interface is designed as if you were chatting away.
It can be used for:
<ul>
<li>Add notes to video lectures.</li>
<li>Give translations to a video.</li>
<li>Add bookmarks to a video.</li>
<li>Easily add links to external resources mentioned in a video.</li>
<li>Create your own Pop-Up Video.</li>
<li>Whatever you can think of.</li>
</ul>
More Information on <a href="http://www.andreboekhorst.nl/wordpress/live-video-annotation-plugin/" title="Andre Boekhorst WordPress Amsterdam" rel="nofollow ugc">the authors website</a>.

Live Video Annotation

The Live Video Annotation plugin allows you to add timed footnotes to a YouTube video. Visitors can see these notes later while watching the video.

Pleaseup.com

Image Hotspots by Pleaseup is a responsive image hotspot plugin that lets you add interactive image maps, tooltips, and annotations to any image with a visual drag & drop editor.
<h3>External services</h3>
This plugin contacts third-party services in two distinct flows. Both flows are triggered only by an authenticated editor (with <code>edit_posts</code>) pasting a URL inside a tooltip; no data leaves the site automatically.
Server-side oEmbed resolution (<code>wp_oembed_get</code>)
When the editor pastes a URL from one of the supported oEmbed providers into a tooltip, the plugin calls the provider’s oEmbed endpoint server-side via WordPress core’s <code>wp_oembed_get()</code> to retrieve the embed HTML. The URL pasted by the editor is sent to the provider; no other data is sent. Supported providers:
<ul>
<li>YouTube — Terms: https://www.youtube.com/t/terms — Privacy: https://policies.google.com/privacy</li>
<li>Vimeo — Terms: https://vimeo.com/terms — Privacy: https://vimeo.com/privacy</li>
<li>Spotify — Terms: https://www.spotify.com/legal/end-user-agreement/ — Privacy: https://www.spotify.com/legal/privacy-policy/</li>
</ul>
Client-side iframe rendering
When a tooltip containing an oEmbed iframe is opened on a public page, the visitor’s browser loads the iframe directly from the provider’s CDN (e.g. <code>youtube.com</code>, <code>player.vimeo.com</code>, <code>open.spotify.com</code>). This is standard browser behavior for any embedded media; the plugin does not add any tracking on top.
The set of allowed iframe hosts is filterable via the <code>wphs_allowed_iframe_hosts</code> filter. Hosts not in the allowlist are stripped from tooltip HTML on save.

Image Hotspots by Pleaseup – Interactive Image Map & Tooltips

Interactive image hotspots with drag & drop editor. Add tooltips, annotations, and image maps. Works with Gutenberg, ACF, and galleries.

Live Video Annotation vs Image Hotspots by Pleaseup – Interactive Image Map & Tooltips