Can anyone please explain to me how to either 1 record video and audio at the same time in cubase 9 or import the video and replace the audio in it. I have been trying to to figure this out for the longest.
You can’t record video in Cubase.
To import a video into a project, go to File>Import>video file. The audio in the file will appear on an audio track, which you can mute, and replace with your new audio track(s).
I believe the function to ‘Replace audio in video’ isn’t operational in C9.03 so you will need to export the audio and attach it to the video in another app.