If you want to embed a video on your WordPress website, into a post or page follow those steps:
To embed a YouTube video, simply copy the video’s URL from YouTube website and paste the HTML iframe code into your post/page.
To do so
click on Share Link , then click on Embed,
highlight the code, select all and copy it.
You may choose video size from Video Size dropdown box
If this is a post ( in WordPress most post pages has sidebar, if so choose small size), if this is a full page then you might b choose larger size video embedding option.
Before you paste the code click on text button in the editor view.
Then paste the code . The video will be playing when a person click on it.
This is the code view:
<iframe width=”560″ height=”315″ src=”//www.youtube.com/embed/3j7e4oavQuI?rel=0″ frameborder=”0″ allowfullscreen></iframe>
This is the embedded video below: