I would do a tutorial but im pretty sure there has been many of those rock chip touch up tutorials done and a place like autopia would ahve good ones.
You wanna fill in the chip a few times, let it dry, wet sand it down wtih 1500/2000 grit and then polish over it in an attempt to smoothly blend the chip.
Ive done it a few times, its time consuming but can be done pretty well if you take your time and know what your doing/ have the right products