This is a very accessible and custom made YouTube-plugin for WordPress.
[accessibleyoutube id=youtubevideoid width=width height=height]
You could also use the Video add button in the TinyMCE WYSIWYG-editor.
That's a shame. Could you please tell me at firstname.lastname@example.org more? Please include information like a link to your blog, your WordPress version and which version you installed.