I remember way back in the day when YouTube was still in a Flash Player, you had the ability to dynamically overlay link buttons and clickable areas over videos at specific times/area and it was a lesser used but nice feature. There were a couple of videos that used it to sneak links to unlisted bonus content but it mostly helped when something was highlighted and clicking it would take you to relevant info. Think you could also use it for spesific playback controls.

I'm scoping out a small project and think it'd be cool to have a video with simmilar basic interactions and even fire off some scripts at different parts of the playback.

Since Flash died, I can't think of any web player that let's you create this sort of dynamic overlay/interface or implement logic to the media playback. I know Adobe Encore can be used to make this sort of stuff for DVD menus and I used to make training videos with old software that did similar things. But I don't believe those files are easily web compatible without Flash.

I'm sure a front-end wizard can layer a transparrent canvas and player and script their way to the same functionality and more. Or maybe use a web game engine and build a UI over video playback. But I'm curious if there's any service or library that does it already and saves me from another abandoned side-quest.

Unless I missed something obvisous, the only similiar functionality I've found in the common player libraries are overlaying adverts at set points in the display and you just set the scale and frequency.