What model GoPro did you get? Your video is much clearer now, but you have some fish-eye effect (image curves at the edges). Unfortunately most new GoPros do not come with a manual, they expect you to just put it on your helmet and sky-dive. For close-up work, you need the setting that is called "cinematic" on my GoPro. It will straighten-out the image, allow you to get closer to the subject. There are mounts sold on Amazon that allow the GoPro to mount to a tripod for stability. If you want to make a camera car, I can help you with that. You may also want to get some close-up lighting, I use shop type lights with a clamp mount. I have an old microphone stand from my Garage-band days and clamp the light to that. I have to make sure that the light is on the subject, not too close to wash-out and a bit to the side so I do not get the shadow of the camera on the image. I have a shadow problem that you may have noticed, when the camera car moves through an area that is spot-lighted.
Anyway, hope Miss Sharon and Benjamin are doing well, and let me know if you need any help.
I am working on a PRR video with a coal train and heavyweight cars, both double headed, have added lots of lights to stations and lamp posts.
Jim