Need help in combining camera views for a video

So I'm making a video and this is how far I got: video. Basically, I want the final video to have the camera movement of the frame on the left while keeping the stationary background of the frame on the right. I used a plane for the Earth screenshot with 2 cameras.

I kind of got what I wanted when I followed these instructions but the camera doesn't move like I want it to even if I assigned a script for it. I'm sure there's an easy way to do this.. I'm just very new at using Unity and would appreciate your help. Also, how does one record a video in the first place?xD Thanks in advance!

[1]: +https://www.youtube.com/watch?v=lWVU7hOLzqI&feature=youtu.be