Hi,

Users the ability to resume a video after pausing or stopping it, even if they have logged off and logged back in (see MDL-48755).

In MDL-48755 danielneis commented commented back in 2018, so please excuse any outdated information:
This feature is very requested by people using Moodle to host videos.
There is an extension for the video.js player that is used by Moodle that uses the store.js to keep tracking of the exection time of the video and on a page refresh ou new view would ask user if he/she would like to resume where left (https://github.com/Reelhouse/videojs-resume). It would not ask to resume across devices. This would require a solution that periodically sends the execution time of the video to the server while playing the video and on a new page load, get the execution time from the server.