ROS Perception in 5 days: 4Surface and object recognition extra exercise answer needed

Can you please provide reference answer???
EXTRA Exercise U3-5

Do the following:

  • Spawn two objects on the table and make them move on the table.
  • Detect one of the objects.
  • Track that object and make the Fetch robot track it with the head to keep the object in the center of its view.

We will work on uploading solutions for this extra course. Take into account that the EXTRA exercises are just for the people that want a challenge. They werent ment to be solved. But its true that having the sollutions would be nice