mpotoka You'll always have a hard time fitting two different resolutions screenshots to each other without PS skills.
We cannot change something on it.
Regards the video frame: Do you want to randomly pick a keyframe and sync the viewport?
- You could try to do that by creating a scene at the position of the keyframe or the other way round.
- Then you could export the video in lossless quality, which results in a series of png pictures that you have to merge into a video
with a third party software
- Before merging the single pngs you could edit some with PS in order to have some overlay effect.