No Auto-embeds feature under the Settings > Media menu.

WordPress will automatically turn that into a YouTube embed when the post is viewed. As of 3.5, Auto-embeds are automatically enabled and there is no setting to turn them off in the WordPress admin pages.

https://codex.www.ads-software.com/Embeds

As of 3.5, Auto-embeds are automatically enabled and there is no setting to turn them off in the WordPress admin pages. Prior to 3.5, there was an “Auto-embeds” checkbox in Administration > Settings > Media SubPanel.

What is the code I am to use for videos that I upload from my media library?