Setup for Camera Video and Photo

Hello everyone, I am a new drone hobbyist and I am trying to understand the mission planner software.
I am encountering several issues though, so I have to ask your help with some question. I have searched for the topic for about half an hour and couldn’t find any answer…

I would like to compute the GSD + time mission for several cameras and make a choice based on that. My question so far is about the image / video resolution which may seem obvious, but I would like to make sure.
Does it make sense that I enter the 4000 * 3000 (12MP) for the photo resolution, and 1980*1080P for the video resolution to find the ground distance in Mission Planner?

Thank You and Bless you in Advance for your answers!