A camera is represented by the EOSCamera class. Once the framework has been initialized, cameras can be accessed by using the EOSManager's getCameras method. This returns an array of all of the connected cameras. The example below shows how to get each camera and print it's description.
//framework has already been initialized
//get a list of cameras
NSArray* cameraList = [[EOSManager sharedManager] getCameras];
//loop through each camera
for (EOSCamera* camera in cameraList){
    //print description
    NSLog(@"Found camera: %@", [camera description]);