You do not need a certain number of subscribers to embed live streams. The subscriber limit is to enable the ability to live stream from a mobile device or through YouTube's API.
To embed a YouTube live video, it's the same as embedding a regular YouTube video. See here:
You can also embed a player that shows the current (or last aired) live video from your channel by using this:
Replace "CHANNEL_ID" with your channel's ID, found in https://www.youtube.com/account_advanced.