I built something to show data like heading, altitude and more... it works semi-automatically and is using Adobe AfterEffects to burn the info into the image. What's the application you thought of?
If you have video caption enabled (srt file is next to the video) then when you play it with a subtitle-compatible player the info will be displayed as overlay.
Dashcam viewer and .srt are a great combination too - and probably the easier approach. But for lack of detail in the .srt we went down a different way. Still keen to know what you guys use it for?