Here is an video demostration, I used sphero as the object to take shots at.
Step 1: You will need:
Hands, brain, and eyes!
Batteries for your camera and NXT
NXT programming software.
USB cable for your nxt to connect to your pc.
Step 2: Step 1
Step 4: Step 3
Step 6: Step 5
Now attach the cables.
Thats the building done! Now lets move on the the programming...
Step 7: Step 6
First put in a loop. then insert a wait-distance block, move block, wait-time block and another move block.
Adjust the wait-distance block to your needs, I had set it to <20cm, however you can set it to 2m if you want!
Make sure all the move blocks like to A, the first move block goes forward and the second goes backwards.
the move blocks should be set to degrees and can vary due to camera sizes, power should be set to around 50-70.
Use brake and NOT coast in the move blocks.
You can also change the waiting time to your needs.