fps player controller using rigidbody without character controller?

Edit:I think the question might have been misunderstood so this is just to clarify.
I have a gameobject which is followed by my main camera.
I can look around with my mouse but cannot move in the direction my mouse is facing(fps game)
Any help will be very useful.
Found the answer…

public Transform plr,cmr;
public Rigidbody rb;
public float xclamp=0f,speed=0f,mousespd=0f;
void Update(){
x = Input.GetAxis("Horizontal") * speed;
y = Input.GetAxis("Vertical") * speed;
Vector3  mov = new Vector3(x, 0f, y);
mov = transform.TransformDirection(mov);

float mousex = Input.GetAxis("Mouse X") * mousespd;
float mousey = Input.GetAxis("Mouse Y") * mousespd;

xclamp -= mousey;

 Vector3 rotplr = plr.transform.rotation.eulerAngles;
 Vector3 rotcmr = cmr.transform.rotation.eulerAngles;

 rotcmr.x -= mousey;
 rotcmr.z = 0;
 rotplr.y += mousex;

 if (xclamp > 90)
          xclamp = 90;
          rotcmr.x = 90;
else if (xclamp < -90f)
       xclamp = -90;
       rotcmr.x = 270;
cmr.rotation = Quaternion.Euler(rotcmr);
plr.rotation = Quaternion.Euler(rotplr);

Hello @JustAbhi
Something like this should work:

//your player and camera gameObjects
public GameObject player;
public GameObject camera;

//Mouse input will be stored in x and y. Rotation speed (kind of sesitivity) 
//is stored in speed, public, so you can change it in the inspector.
//By default it will be null (zero), so it will not work until you change it.
float x;
float y;
public float speed;

void Update()
//Read mouse input values.
 x = Input.GetAxis("Mouse X");
 y = Input.GetAxis("Mouse Y");

//Rotate the player right and left
player.transform.Rotate(0, x * speed, 0);

//Look up and down only with your camera
camera.transform.Rotate(y * speed, 0, 0);

@azerty0220pl Thanks for the ans.
But I am asking how do i make my player move in the direction my camera is facing