You don't need ghillie! Just one fertilized egg! (I used bronto)

Step 1: Drop the egg and wait for the parent to start eating.

Step 2: Sneak into the nest (ideally giving the parent a wide berth) and play one game with the baby.

Step 3: Hop out of the nest and quickly grab the egg away from the parent. If it aggros on to you run away from the nest because the parent will only chase you so far from the nest.

Step 4: Drop the egg again and repeat the other steps until you tame your gigantoraptor!

Note: This method might be patched in the future so just keep that in mind.