Jittering effect when moving character and camera

Hey!
I want to make a game and I wrote some code that really suits my needs but I'm having a problem. When I'm moving the character and the camera at the same time I get t$$anonymous$$s really weird jitter effect. When I'm moving only the camera or the character I don't get t$$anonymous$$s. Here is my code for the camera:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class MouseLook : MonoBehaviour
 {
 
     public float speedH = 2.0f;
     public float speedV = 2.0f;
 
     private float yaw = 0.0f;
     private float pitch = 0.0f;
 
     public Transform tran;
     //T$$anonymous$$s tran is the character transform
 
 
     // Use t$$anonymous$$s for initialization
     void Start()
     {
 
     }
 
     // Update is called once per frame
     void Update()
     {
 
         yaw += speedH * Input.GetAxis("Mouse X");
         pitch -= speedV * Input.GetAxis("Mouse Y");
 
         transform.eulerAngles = new Vector3(pitch, yaw, 0.0f);
         tran.rotation = Quaternion.Euler(0, yaw, 0);
 
     }
 }
 

And t$$anonymous$$s is the character code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerMove : MonoBehaviour {
 
         public float speed;
 
         private Rigidbody rb;
         private Transform tr;
 
         void Start()
         {
             rb = GetComponent<Rigidbody>();
             tr = GetComponent<Transform>();
         }
 
         void FixedUpdate()
         {
             float moveHorizontal = Input.GetAxis("Horizontal");
             float moveVertical = Input.GetAxis("Vertical");
 
         rb.MovePosition(tr.position + (tr.right * moveHorizontal * (speed * 0.01f) + (tr.forward * moveVertical * (speed * 0.01f))));
 
     }
 }
 

So I tried a lot of stuff but not$$anonymous$$ng works. How do I make t$$anonymous$$s work without jittering? EDIT: Here is the gif of the jittering. Look at the cube. You don't see it when the gif is small. Just zoom in the page. http://imgur.com/6yChVjI