CameraFollow.cs

using UnityEngine;

using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.Serialization;

public class CameraFollow : MonoBehaviour
{ 
    [FormerlySerializedAs("smoothSpeed")] [SerializeField] private float m_smoothSpeed = 0.125f;
    [FormerlySerializedAs("lookSensitivityMultiplier")] [SerializeField] private float controllerLookMultiplier = 5f;

    private float finalSmoothSpeed;
    private InputAction LookInput;
    private Vector2 m_desiredPosition;
    private Vector2 m_smoothedPosition;

    private void Start()
    {
        LookInput = InputSystem.actions.FindAction("Look");
        LookInput.performed += OnLook;
    }
    private void OnLook(InputAction.CallbackContext context)
    {
        
        if (context.control.device is Gamepad)
        {
            Vector2 inputVector = LookInput.ReadValue<Vector2>();
            m_desiredPosition =
                new Vector2(transform.position.x + inputVector.x, transform.position.y + inputVector.y);
            finalSmoothSpeed = controllerLookMultiplier;

        }
        else if (context.control.device is Mouse)
        {
            Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            m_desiredPosition = new Vector2 (mousePosition.x, mousePosition.y);
            finalSmoothSpeed = m_smoothSpeed;
        }

    }
    private void Update()
    {
        m_smoothedPosition = Vector2.Lerp(transform.position, m_desiredPosition, finalSmoothSpeed);
        transform.position = new Vector3(m_smoothedPosition.x, m_smoothedPosition.y, transform.position.z);
    }

}