Help needed! After Effects - About Envato Tuts+ course 30 Days of learning After Effects

I need help with a video project in After Effects.

I followed the course 30 days to learn After Effects by VinhSon Nguyen, and I am struggling with applying a camera movement to a video file. It is a dance footage video recorded on a still tripod, but I would like to add camera movement as if the cameraman was moving around the room instead of being still on a tripod.

What I tried to do is add a new camera layer into the composition, however when using the camera tools, I only seem to be able to play around with the illustrative objects in this composition like text and illustrations, but not the base video itself. I am probably doing something wrong but cannot figure out what.

If anyone could give me a hand with this I would be very thankful.

Kind regards,