ActionTowerDefense/ActionTowerDefense/Assets/Scripts/CameraController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraController : MonoBehaviour
{
    public float offsetX = 6, offsetY = 3, offsetZ = -16;
    public float lerpValue = 3.5f;

    [HideInInspector]
    public Vector3 targetPos;

    public Camera mainCamera;
    public GameObject cameras;
    public Camera leftCamera;
    public Camera rightCamera;

    private void FixedUpdate()
    {
        if (PlayersInput.instance[0] == null)
        {
            targetPos = Vector3.zero + new Vector3(0, offsetY, offsetZ);
        }
        else if(PlayersInput.instance[1] == null)
        {
            targetPos = CameraTargetMove(PlayersInput.instance[0]);
        }
        else
        {
            targetPos = Vector3.Lerp(PlayersInput.instance[0].transform.position,
                PlayersInput.instance[1].transform.position, 0.5f) + new Vector3(0,offsetY,offsetZ);
        }

        transform.position = Vector3.Lerp(transform.position, targetPos, lerpValue * Time.deltaTime);
    }

    Vector3 CameraTargetMove(PlayerController player)
    {
        if (player.bodyTrans.localScale.x > 0)
        {
            targetPos = player.transform.position + new Vector3(-offsetX, offsetY, offsetZ);
        }
        else
        {
            targetPos = player.transform.position + new Vector3(offsetX, offsetY, offsetZ);
        }
        return targetPos;
    }
}