Even with the Overlay HTML (Text: HTML) filter what you are trying to do would be a tall order. How much detail do you want, e.g:
- Do you want to trace along the roads that they drove, or do you just want to draw a single straight line from where they were on day 1 to where they arrived on Day2?
- Do you want the trace lines to crawl along as your grandmother speaks, or jump from A to B at the beginning/end of that section she is speaking about (like a slideshow)?
Google maps has a feature to let you plot out routes, I used it for the trips my wife and I did in New Zealand a few years ago, but it is quite fiddly to use and is not very interactive.
One guy had a similar request on the forum (for a motorbike ride). He solved it by capturing the GPS data as he rode along and importing it into Google Earth to create a KML file that he could then play back, record the screen and syncing it with the motorbike footage in Shotcut. See here: