Camera Collision Not Working

I am currently following Quill18Creates' Youtube Tutorial on making a 2D Game; Clony Bird. However, I am creating a FP 3D version and referencing to $$anonymous$$s 2D scripts and converting them. Everyt$$anonymous$$ng has gone kind of well until it came down to my camera; my first person. It is a normal camera. I want to make it collide with the pipes and terrain, but it just goes through. I have placed a cube with a collider around it (parented) tried rigidbody and sphere/box colliders (triggered and not triggered). Here is the movement script so far.

 using UnityEngine;
 using System.Collections;
 
 public class BirdControl : MonoBehaviour {
 
     Vector3 velocity = Vector3.zero;
     public Vector3 gravity;
     public Vector3 flapVelocity;
     public float maxSpeed = 5f;
     public float forwardSpeed = 10f;
     
     
     
     bool didFlap = false;
     
     Animator animator;
     
     bool dead = false;
     
     // Use t$$anonymous$$s for initialization
     void Start () {
     animator = transform.GetComponentInC$$anonymous$$ldren<Animator>();
     }
     
     void Update () {
     if(Input.GetMouseButtonDown(0)) {
     didFlap = true;
         }
     
     }
     
     
     void FixedUpdate () {
     
     if(dead)
     return;
     
     velocity.z = forwardSpeed;
     velocity += gravity * Time.deltaTime;
     
     
     if(didFlap == true) {
     didFlap = false;
     if(velocity.y < 0)
     velocity.y = 0;
     
     velocity += flapVelocity;
     }
     
     velocity = Vector3.ClampMagnitude(velocity, maxSpeed);
     
     transform.position += velocity * Time.deltaTime;
     
     float angle = 0;
     if(velocity.y < 0){
     angle = Mathf.Lerp(0, -90, velocity.y / maxSpeed);
       }      
     transform.rotation = Quaternion.Euler(0, 0, angle);
       
           
     }
 
     void OnCollisionEnter(Collision collision) {
     animator.SetTrigger("Death");
     dead = true;
     
     
     }
     
     
 }

Because I'm referencing to quill18creates, ($$anonymous$$s original script) credit to $$anonymous$$m and $$anonymous$$s channel.