Step 1, easy way please copy and paste in new tab link below
https://developers.facebook.com/docs/plugins/embedded-video-player/
and what do you need?
video for web?, just need url? video for worldpress? Blogger?
example
Video for Blogger
After we read description (Step-by-Step)
just do it same intructions
1. Pick a URL
2. Drop url in -> Embedded Video Player Configurator
3. Get Code
4. and check what type code u need [for blogger we need take copy and paste iframe(HTML) ]
5. Copy
6. Visit blogger, edit or create new post then Paste Code
Its DONE, you can save publish Now ^^