To make a camera stick to a path, bring up the camera's properties. This can be done by selecting the wireframe of the camera in "director's view" mode. Then click 'A' on the camera's toolbar. This will bring up the properties dialogue. Select the tab entitled "Linking" and choose the drop down menu "Object Parent Name". In that list you should be able to find the name of the path. Select the name, click the checkmark on the dialogue and it's done!