I kinda saw an article other day where a finger gripper gripping and lifting and egg without cracking or breaking it.
Post a link, if you want people to know what you're referring to.
I was wondering if someone could give me an insight on the technology used in this type of grippers.
Without a link, we can only guess!
There's several methods for controlling the amount of power to below the egg-breaking-point; force feedback via one of a number of sensors (cheap homemade or store bought expensive), "torque" control of the actuator with a preset maximum, sensors that detect when an object is slipping (to increase pressure to the point where it's not) etc.
But, if this is your first mechatronics project, I'd recommend a little less ambition - build something simpler and learn while you go.