Telemetry Overlay on saved videos

Hi Everyone !

I’m a current user of a BlueROV2 then I also use QGroundControl to manipulate it. But I want to add telemetry overlay on saved videos. Some tutorials says that the software might be able to create subtitles files which include telemetry measurements: ;

But none of them can really help me out because there is no step to follow.
Please, did someone had a solution for me ?

Note: I have to say that I’m under Windows OS