How to programmatically add an icon to a video thumbnail?

Question

C++ / C#

Hello. One problem has been bothering me for a long time: when watching TV shows, I just can’t remember the number of the last episode, every time I have to re-search for the next episode. I understand that it would be possible to simply write down the episode number somewhere, but I really don’t want to do this, because I’m too lazy. So one idea came to my mind: "What if the corresponding icon is hung on the watched episode." Here's how it might look like:
Green icon - the episode has been watched, orange - it has been started, but not finished, if there is no icon, then the episode has not been touched yet.
So, I'm interested in whether it is possible to programmatically add an icon to the thumbnail using c #, and if so, how? Thanks

Answer 1

Of course it's possible: Icon Overlay Handlers , an example implementation in C#