Hello David!
I have searched the database and have found two addresses for Gene Wilder:
Gene Wilder
1511 Sawtelle Boulevard #155
Los Angeles, CA 90025
USA
or
Gene Wilder
c/o David Shapira & Associates
15821 Ventura Blvd
Encino, CA 91436
USA
Both should work!
Personally I wouldn't send DVD's in the post! I would send a DVD cover or a photo that you could print off the internet for him to sign!
This would ensure that if your letter was lost, no valuables would be lost!
I am unsure as to whether Gene still signs or not - but it's worth a try!
Remember! NO VALUABLES!
Good Luck!
I hope that this information is useful to you and I wish you the best in your quest!
PS. Your English is very good!