Initializing two webcams for stereo vision to Oculus DK2

Hiya guys,

So, I just recently started working in Unity for a research project and a part of it requires me to integrate 2 webcams (which is actually an old OVRVision 1 that is no longer supported and is out of date for the latest stable Unity version) and project each to a different eye of an Oculus DK2. I made a single Camera object and included this script with it:

 using UnityEngine;
 using System.Collections;
 
 public class WebCam : MonoBehaviour {
 
     private Camera leftEye = new Camera();
     private Camera rightEye = new Camera();
     private Material renderTextureLeft;
     private Material renderTextureRight;
 
     // Use this for initialization
     void Start()
     {
         WebCamTexture leftCamera = new WebCamTexture("Left camera");
         WebCamTexture rightCamera = new WebCamTexture("Right camera");
 
         leftCamera.Play();
         rightCamera.Play();
 
         //Left Eye
         renderTextureLeft.mainTexture = leftCamera; //Line
         leftEye.targetTexture = (RenderTexture)renderTextureLeft.mainTexture;
         leftEye.stereoTargetEye = StereoTargetEyeMask.Left;
             
         //Right Eye
         renderTextureRight.mainTexture = rightCamera;
         rightEye.targetTexture = (RenderTexture)renderTextureRight.mainTexture;
         rightEye.stereoTargetEye = StereoTargetEyeMask.Right;
 
     }
     
     // Update is called once per frame
     void Update()
     {
     
     }
 }
 

It gives me the error "NullReferenceException: Object reference not set to an instance of an object" at "//Line" so I figure I'm forgetting to do something very basic, but I can't quite catch what it is. Also, I do print out the device names so the names should be fine. VR in player settings is enabled and I'm using the latest beta build (5.4.0b25).

Any help would be much appreciated!