[Eclip$e]

you'd have the code grab info from the camera you're using to locate the line.
the line would need to stand out from the background.
so the line follower robot would need to move towards the specific rgb or hex putting it under its self or directly in front of the camera this will take a few if statements and good movement commands.

google everything of what i just said in short bunches to what you need. ex: "How to get info from a camera such as colors."
gl with your project.