Video Cameras

Below are 9 video cameras. They are locked by a password.
Solve each room-puzzle to obtain the password for each video cameras.
Make sure you carefully follow the instructions for the answer keys.

VDO: Ballroom
VDO: Billiard Room
VDO: Conservatory
VDO: Dining Room
VDO: Hall
VDO: Kitchen
VDO: Library
VDO: Lounge
VDO: Study