I would create a text event, and make it move via animated pan/crop or placement (text property).
Then just copy/paste that event, and change the text to the next chord. If you need more chords on the screen you can have them on more tracks.
But, what if you create those marks of the chords (on the left of the original video)?
You could draw them as graphic, and show only one at a time, which is being played.
Wouldn't that look better?
(I'm not a guitarist... :))