Switch Unity Render Camera for Video Mapping

RenderCameraSwitcher.cs

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

/// <summary>
/// Switches the camera automatically depending on the scene required.
/// </summary>
public class RenderCameraSwitcher : MonoBehaviour {
    public RenderTexture renderTexture;
    protected Camera lastCamera;

    /// <summary>
    /// Switches the camera that is currently being rendered by the render texture.
    /// </summary>
    /// <param name="camera">New camera that will be rendered.</param>
    public void SwitchCamera(Camera camera) {
        // Stops rendering the last selected camera.
        if (lastCamera != null)
            lastCamera.targetTexture = null;

        // Change the currently rendered camera.
        camera.targetTexture = renderTexture;
        lastCamera = camera;
    }
}