AlignCameraView.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
[InitializeOnLoad]
public class AlignCameraView : MonoBehaviour {

    public bool Enable;
    public static List<AlignCameraView> list;

    static AlignCameraView()
    {
        EditorApplication.update += UpdateFunction;
        list = new List<AlignCameraView>();
    }

    public AlignCameraView()
    { // regular constructor where we add this to static list
        AlignCameraView.list.Add(this);
    }

    static void UpdateFunction()
    {
        foreach (AlignCameraView mc in list)
        {
            mc.UpdatePosition();
        }
    }

    public void UpdatePosition()
    {
        if (Enable) { 
            transform.position = SceneView.lastActiveSceneView.camera.transform.position;
            transform.rotation = SceneView.lastActiveSceneView.camera.transform.rotation;
        }
    }
}