AVPlayer play video from URL in Firebase Database

I have prototype cells that automatically pull text from a Firebase database. I want to incorporate videos into this as well. How would I use AVPlayer to play a video from a URL in the FireBase database. I want it to be as automatic as possible.

I am not an experienced developer and am stumbling through this, so please provide "baby level" answers.

Here is the code for the cells that pull from firebase.

//
//  FirebaseVidoes.swift
//  Faces of the Holocaust Photographic History
//
//  Created by New User on 8/25/17.
//  Copyright © 2017 New User. All rights reserved.
//

import UIKit
import Firebase
import AVKit
import AVFoundation

struct postStruct {
    let title : String!
    let message : String!
    //let image : UIImage!
}


class FirebaseVidoes: UITableViewController {


    var posts = [postStruct]()



    override func viewDidLoad() {
        super.viewDidLoad()
     
        tableView.backgroundView = UIImageView(image: UIImage(named: "polandBackgroundBlur.jpg"))
     
     
        let databaseRef = Database.database().reference()
     
        databaseRef.child("Posts").queryOrderedByKey().observe(.childAdded, with: {
         
            snapshot in
         
            let snapshotValue = snapshot.value as? NSDictionary
            let title = snapshotValue?["title"] as? String
            let message = snapshotValue?["message"] as? String
            //let image = snapshotValue?["image"] as? UIImage
         
            self.posts.insert(postStruct(title: title, message: message) , at: 0)
            self.tableView.reloadData()
         

        })

     
        //post()
        // Do any additional setup after loading the view.
    }


    func post(){
     
        let title = "Title"
        let message = "Message"
     
     
        let post : [String : AnyObject] = ["title": title as AnyObject,
                                            "message": message as AnyObject]
     
     
        let databaseRef = Database.database().reference()
     
        databaseRef.child("Posts").childByAutoId().setValue(post)
     
     
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
     
        return posts.count
     
    }



    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
     
        var cell = tableView.dequeueReusableCell(withIdentifier: "Cell")
     
        let label1 =  cell?.viewWithTag(1) as! UILabel
            label1.text = posts[indexPath.row].title
     
        let label2 = cell?.viewWithTag(2) as! UILabel
            label2.text = posts[indexPath.row].message
     
        //let image1 = cell?.viewWithTag(3) as! UIImage
            //image1.UIimage = posts[indexPath.row].image
     
     
     
        return cell!

    }




}

And Here is the AVPlayer Code

/
/
/
/
/
/
/
import UIKit
import AVKit
import AVFoundation
class VideoTest: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        /
    }
    @IBAction func watchVideoDidClick(_ sender: Any) {
      
        playExternalVideo()
    }
  
    let videoURL = "    
    func playExternalVideo(){
        
        let videoURL = NSURL(string: self.videoURL)!
        
        let player = AVPlayer(url: videoURL as URL)
        let playerViewController = AVPlayerViewController()
        
        playerViewController.player = player
        
        self.present(playerViewController, animated: true) {
            () -> Void in
            playerViewController.player!.play()
        }
        
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        / 
    }
    
    /
    /  
    / 
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        / 
        / 
    }
    */
}

How can I merge these to automatically populate the cell