Where is the camshaft position actuator circuit located?

With the hood open, look at the end of the engine where the belt drive is. In the center of the engine on top is the sensor. Might I ask what the issue with the vehicle is? Do you have a camshaft circuit code or a cam crank correlation code?

Yes, I keep getting code p0010 on my 2011 Impala Ltz.

Okay, then you want to check the cam position actuator magnet and the cam position sensor. The actuator magnet is on the front of the engine at the top of the timing cover. Testing really needs to be done with a scan tool so you can command the magnet on and off and watch the signal on the sensor at the same time. Then you can connect a test light in place of the magnet and turn it on and off with the tool to verify the circuit operates.