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From Elxis Official Documentation

YouTube Plus is a bot for Elxis CMS by which you can display a YouTube video into a content item or an autonomous page of an Elxis site, setting each time width and height of video. Values of width and height must be absolute.

In version 1.2 has been added the parameter relvideo which gives the option to include (?rel=1) or not (?rel=0) relative videos.

General Usage: {youtube_plus}video_id,relvideo,width,height{/youtube_plus}

Example: {youtube_plus}EZHR569uoew,?rel=0,425,350{/youtube_plus}

For this bot is available a correspondent bot button version, as well a module version.