Create multiple buttons and play video url on click,Unity 3d

Question

I am trying to create multiple buttons with Unity 3d and add each of them on click listener, when the user clicks it should open the given link to the video player , I am beginner in unity and please help me I tried this one

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Video;


/// <summary>
/// Unity VideoPlayer Script for Unity 5.6 (currently in beta 0b11 as of March 15, 2017)
/// Blog URL: http://justcode.me/unity2d/how-to-play-videos-on-unity-using-new-videoplayer/
/// YouTube Video Link: https://www.youtube.com/watch?v=nGA3jMBDjHk
/// StackOverflow Disscussion: http://stackoverflow.com/questions/41144054/using-new-unity-videoplayer-and-videoclip-api-to-play-video/
/// Code Contiburation: StackOverflow - Programmer
/// </summary>


public class StreamVideo : MonoBehaviour {

    public RawImage image;
    public GameObject playIcon;

    public VideoClip videoToPlay;

    private VideoPlayer videoPlayer;
    private VideoSource videoSource;

    private AudioSource audioSource;

    private bool isPaused = false;
    private bool firstRun = true;

    IEnumerator playVideo() {
        playIcon.SetActive(false);
        firstRun = false;
        //Add VideoPlayer to the GameObject
        videoPlayer = gameObject.AddComponent<VideoPlayer>();

        //Add AudioSource
        audioSource = gameObject.AddComponent<AudioSource>();

        //Disable Play on Awake for both Video and Audio
        videoPlayer.playOnAwake = false;
        audioSource.playOnAwake = false;
        audioSource.Pause();

        //We want to play from video clip not from url

        videoPlayer.source = VideoSource.VideoClip;

        // Vide clip from Url
        //videoPlayer.source = VideoSource.Url;
        //videoPlayer.url = "http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4";


        //Set Audio Output to AudioSource
        videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;

        //Assign the Audio from Video to AudioSource to be played
        videoPlayer.EnableAudioTrack(0, true);
        videoPlayer.SetTargetAudioSource(0, audioSource);

        //Set video To Play then prepare Audio to prevent Buffering
        videoPlayer.clip = videoToPlay;
        videoPlayer.Prepare();

        //Wait until video is prepared
        while (!videoPlayer.isPrepared) {
            yield return null;
        }

        Debug.Log("Done Preparing Video");

        //Assign the Texture from Video to RawImage to be displayed
        image.texture = videoPlayer.texture;

        //Play Video
        videoPlayer.Play();

        //Play Sound
        audioSource.Play();

        Debug.Log("Playing Video");
        while (videoPlayer.isPlaying) {
            Debug.LogWarning("Video Time: " + Mathf.FloorToInt((float)videoPlayer.time));
            yield return null;
        }

        Debug.Log("Done Playing Video");
    }

    public void PlayPause() {
        if(!firstRun && !isPaused) {
            videoPlayer.Pause();
            audioSource.Pause();
            playIcon.SetActive(true);
            isPaused = true;
        } else if (!firstRun && isPaused) {
            videoPlayer.Play();
            audioSource.Play();
            playIcon.SetActive(false);
            isPaused = false;
        } else {
            StartCoroutine(playVideo());
        }
    }
}

but it only plays one video ,I don't know how to create buttons and how to add on click event listener that should play the selected video on the video view in landscape mode,can someone give me some example with one button, how to interact the buttons with the video player , I will appreciate your help