There are high end custom whole house video distribution systems that will do what you want to do but they will be very expensive. The easiest would be to convert all your DVDs to ISO (if you want to keep the menus, extras, etc), and host them on a server of some sort. You can then place wireless streaming players around the house. This, however, will take a lot of time ripping your 2800 DVDs.
Micca Support Specialist