Android Move and rotate to game

How would I go about creating a script which gets the physical movement of the device and moves the in game camera? I also want to be able to look around.

What I'm after creating a project which uses my android device as a window to another world. I want to be able to physically walk around something with my device in front of me. I also want to be able to look around freely.

I can create games, and I know how to create a first person game. I would however like it to be controlled with physical movement this time.

How would I go about doing this? (I don't know how to explain this properly.)