Very little material is sufficient
You already have the most:
A bike that became a coat rack for years because it is too tedious to be used alone
A TV monitor
You only need:
Omboxx software testing or for sale on this site.
One Kinect for Windows
The video below shows you the most simple installation using a video-short-throw projector that can be implemented in any room of your home.
You can play against the computer or against a real partner, you have another bike in this case only.
In the currently programmed upgrades you can play online against a remote opponent anywhere around the world, participate in tournaments …