Yep, the video module is a Pro app (https://unacms.com/pro). However Youtube videos can seamlessly be played using embed providers packed with UNA: Embed.ly, Iframely and oEmbed.

Just paste your Youtube link into any text area in UNA (Timeline, comments etc) and it will be converted to an embedded video.

You need to enable that feature here:

UNA Studio > Settings > General > Embeds provider

Both Embed.ly and Iframely offer free and paid plans. oEmbed is an open source script. It's free but a bit limited.