New Twiddle

components.video-container.js

import Ember from 'ember';

export default Ember.Component.extend({
  isOn: true,
  
  didRender() {
    const videojs = this.element.querySelector('.videojs');
    videojs.appendChild(this.element.querySelector('.custom-buttons'));
  },
  
  actions: {
    toggleState() {
      this.toggleProperty('isOn');
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  actions: {
    generateURL() {
      this.set('url', Math.random());
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>

<button {{action "generateURL"}}>Generate URL</button>
{{video-container url=url}}
<br>
<br>

templates.components.video-container.hbs

<style>
.videojs {
	border: 5px solid red;
}
</style>
<div class="videojs">
URL: {{url}}
</div>

<div class="custom-buttons">
  <button {{action "toggleState"}}>
  {{#if isOn}}
  	On
  {{else}}
  	Off
  {{/if}}
  </button> 
	{{yield}}
</div>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}