Selecting a camera when connecting multiple cameras in Unity

I am trying to show AR video by connecting the hand tracking camera device (Leap motion: window device manager list: 0) and webcam camera (window device manager list: 1) in Unity.

Leap motion connects using the manufacturer's SDK and package files, so there is no need for additional coding to connect the camera in Unity.

The problem occurs when I connect a webcam camera (window device manager list: 1) in Unity and show AR video.

When the following code is applied to an object, if both Leap motion and webcam camera are connected, leap motion is recognized and output as video, and video output of webcam camera becomes impossible.

If only the webcam is connected after unplugging the leap motion from the PC, the video output of the webcam camera is possible.

I want to output video by selecting webcam camera (window device manager list: 1) on the object with both Leap motion and webcam camera connected to the PC.

Since I am a beginner in Unity, I need to simply modify it in the code below.

Waiting for help.

 using UnityEngine;
 using System.Collections;
  
 public class WebCam : MonoBehaviour {
  
     // Use this for initialization
     void Start () {
         WebCamTexture web = new WebCamTexture(1280,720,60);
         GetComponent<MeshRenderer>().material.mainTexture = web;
         web.Play();
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 }