For the play bar, you could also try to create your own version of a linear gauge with the scroll collection.
Just brainstorming here, but I’d start by using @Seb 's advice above, and then convert those two values into a percentage. (If that seems difficult to do with two time values, maybe try and convert the video times to seconds)
Put a simple rectangle in a scroll collection, overflowing past the x boundaries, and bind the x % of the percentage of the scroll collection to the % complete from your conversion above. It should tick along with your video. But you won’t be able to actively scroll this play bar to jump to a time in the video. You may need to get a little creative to accomplish that. Good luck.