Automatically Embed YouTube Video and/or Playlist by Post Tags

I am trying to have either an embedded YouTube video appear automatically in a post, based on the post tags, or have a playlist of related videos relevant to the post content automatically appear in the post.

TubePress won’t do it, I have to manually enter the keyword for each video in each post.

The only plugin I have found to do this is [GWA] Dynamic YouTube Videobar, but it’s a bit old and difficult to customise. There is no close icon on the player that pops up, and I am unable to position the player where I want it. The video thumbnails are low resolution as well.

Does anyone know of a better solution? Being able to automatically display YouTube videos relevant to post tags would be great.