We can not fetch videos from this type of page.
Your URL was: http://www.youtube.com/verify_age?next_url=/watch%3Fv%3DY3x8pzS1nDk
http://www.youtube.com/verify_age?next_url=/watch%3Fv%3DY3x8pzS1nDk
The URL must be like http://www.youtube.com/watch?v=KPtX7hak0Qs
http://www.youtube.com/watch?v=KPtX7hak0Qs
https://www.
pwn
Example: