searxng/searx/templates/result_templates/videos.html

<div class="result">
  {% if result['favicon'] %}
    <img width="14" height="14" class="favicon" src="static/img/icon_{{result['favicon']}}.ico" />
  {% endif %}

    <p>
      <h3 class="result_title"><a href="{{ result.url }}">{{ result.title|safe }}</a></h3>
      <a href="{{ result.url }}"><img width="400px" src="{{ result.thumbnail }}" title={{ result.title }} alt=" {{ result.title }}"/></a>
      <p class="url">{{ result.url }}</p>
    </p>
</div>