Set up the green screen. It can be nothing more than a bright green cloth or green painted wall. For the best results, buy a screen. Attach the screen to a stand. Smooth out any wrinkles.
Light the green screen evenly. Use two or more lights. This will eliminate shadows and make keying the video easier.
Set up the camera on a tripod so that the edges of the green screen are not in the frame. Turn on the camera.
Connect a video output cable to the camera. The type of cable will vary by camera model; HDMI, USB and RCA are the most common.
Plug the other end of the video cable into the computer's "Video in" port.
Open the keying software. There are dozens of keying software packages, including FXHome, GreenScreen Wizard, 123 Video Magic and Adobe After Effects.
View your images on the computer. Key the green screen to make the background disappear. Add a background, such as a photo of Paris or a jungle. Play some music; your music video machine is ready.