The main thing to remember when embedding video into a webpage is that not all devices can play all formats – in some engines you may find that if you provide only one video format, your page may not rank well on devices which cannot play the video.

You should always include as much crawlable data as possible about the video so that indexers can understand it – namely by including the video within the XML sitemap, but also by including a reference to a subtitle file, a transcript of the video and marking the page up with appropriate microdata.