How do I get the video media path in a theme?
It's unclear whether you want to get one or multiple videos:
// get one video media entity
$video = $row-&gt;_entity-&gt;get('field_pvideo')-&gt;entity;
// get multiple video media entities
$videos = $row-&gt;_entity-&gt;get('field_pvideo')-&gt;referencedEntities(); 

Then in Twig for one video:
{{ programme.video.field_media_video_embed_field.value }}

or multiple videos:
{% for video in programme.videos %}
  {{ video.field_media_video_embed_field.value }}
{% endfor %}