added course prototype, image switch not working yet

Assets/Scripts/StartPause.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Video;
+using UnityEngine.UI;
+
+public class StartPause : MonoBehaviour
+{
+    public VideoPlayer player;
+    public Button button;
+    public Sprite pauseSprite;
+    public Image image;
+
+    private int word_i = 0;
+    // In my example, i have 4 videos/images
+    private int max_words = 4;
+    
+    // Start is called before the first frame update
+    public void Start()
+    {
+        next_video();
+        //next_image();
+
+        button.image.sprite = pauseSprite;
+        Color col = button.image.color;
+        col.a = 255;
+        button.image.color = col;
+    }
+
+    // These two functions generate video and image from files 
+    private void next_video(){
+        player.url = $"Assets/Videos/{word_i}.mp4";
+    }
+
+    // This doesn't work
+    private void next_image(){
+        Sprite tex = Resources.Load($"Assets/Images/{word_i}.png") as Sprite;
+        image.sprite = tex;
+    }
+
+    // Activate by pressing the center of the screen
+    public void Pause()
+    {
+        if (!player.isPlaying)
+        {
+            player.Play();
+            Color col = button.image.color;
+            col.a = 0;
+            button.image.color = col;
+        }
+        else
+        {
+            player.Pause();
+            Color col = button.image.color;
+            col.a = 255;
+            button.image.color = col;
+        }
+    } 
+
+    // Press next-sign button for next word
+    public void NextSign(){
+        // Fetch next video and image from log
+        // Idea : do this by numbering video's and images and using increment to find them.
+        word_i++;
+        word_i %= max_words;
+        next_video();
+        //next_image();
+    }
+}

Assets/Scripts/StartPause.cs.meta

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Assets/Scripts/Webcam.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.SceneManagement;
+
+public class Webcam : MonoBehaviour
+{
+    int camdex = 0;
+    WebCamTexture tex;
+
+    public RawImage display;
+    public Button nextSignButton;
+
+    void Awake(){
+        WebCamDevice device = WebCamTexture.devices[camdex];
+        tex = new WebCamTexture(device.name);
+        display.texture = tex;
+
+        tex.Play();
+    }
+
+    public void SwapCam(){
+        if(WebCamTexture.devices.Length > 0){
+            // Stop the old camera
+            display.texture = null;
+            tex.Stop();
+            tex = null;
+
+            // Find the new camera
+            camdex += 1;
+            camdex %= WebCamTexture.devices.Length;
+
+            // Start the new camera
+            WebCamDevice device = WebCamTexture.devices[camdex];
+            tex = new WebCamTexture(device.name);
+            display.texture = tex;
+
+            tex.Play();
+        }
+    }
+    // Scene changing is implemented here to avoid problems with webcam
+    public void loadScene(string sceneName) {
+        display.texture = null;
+        tex.Stop();
+        tex = null;
+
+        SceneManager.LoadScene(sceneName);
+    }
+}

Assets/Scripts/Webcam.cs.meta

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