Aloha T, and funny you should ask.
I don’t normally do a video sort of thing but in responding
to a users post:
I found that when I went to ‘import’ a video file into a project,
Cubase first asked me if I wanted to delete (or extract. I can’t remember which)
the audio from the file.
In my case I said ‘no’ but this option should work for you.
Give it a try and Good luck!
{‘-’}