is a head bob animation possible for first person controller with capsule collider

Hi, I'm new to unity and I don't know a lot yet. I'm creating a first person game and I would like to add a headbob animations to my first person character (it uses a capsule collider and rigidbody not a character controller). there is only one problem: I have no idea where to start.

I have watched and read some tutorials and used some scripts from the internet but none of them work. I noticed that they didn't work because it referred to a CharacterController component which I don't have. Does anyone have a working c# script for a headbob which I can use (preferably not the script from the standard assets package) or give me a short explanation of what I have to do. I put a code down here that didn't work so if you can modify it so it would work for me It would be awesome.

a code I found on here which doesn't worked for me

   private float timer = 0.0f;
   float bobbingSpeed = 0.18f;
   float bobbingAmount = 0.2f;
   float midpoint = 2.0f;
   
   void Update () {
      float waveslice = 0.0f;
      float horizontal = Input.GetAxis("Horizontal");
      float vertical = Input.GetAxis("Vertical");
   
   Vector3 cSharpConversion = transform.localPosition; 
   
      if (Mathf.Abs(horizontal) == 0 && Mathf.Abs(vertical) == 0) {
         timer = 0.0f;
      }
      else {
         waveslice = Mathf.Sin(timer);
         timer = timer + bobbingSpeed;
         if (timer > Mathf.PI * 2) {
            timer = timer - (Mathf.PI * 2);
         }
      }
      if (waveslice != 0) {
         float translateChange = waveslice * bobbingAmount;
         float totalAxes = Mathf.Abs(horizontal) + Mathf.Abs(vertical);
         totalAxes = Mathf.Clamp (totalAxes, 0.0f, 1.0f);
         translateChange = totalAxes * translateChange;
         cSharpConversion.y = midpoint + translateChange;
      }
      else {
         cSharpConversion.y = midpoint;
      }
   
   transform.localPosition = cSharpConversion;
   }