Wherever the Player moves, a Cameraman object will smoothly follow him/her. The game's camera will focus on this Cameraman object instead of the Player object.

1. The Cameraman always accelerate and decelerate to provide a smooth moving experience. So click the object, go to the Moving and Jumping tab, and check all of the Move Type: Accelerated checkboxes.
2. When accelerating the Cameraman can not move faster than the Player. So use "Change Switch/Variable" and make the Cameraman's Horizontal & Vertical Max Movement = the Player's Horiizontal & Vertical Max Movement
3. Use "Move Object" to move the Cameraman to the center of Player. Feel free to set all of the other numbers as you see fit. You can also adjust the X & Y position too if you think the center location is no good (too low/high, or you want the Cameraman to follow behind the Player).
4. All of these 3 steps need to be executed repeatedly so copy the action box and make them loop each other.
5. Put the Cameraman on the stage and make the game's camera focus on it instead of the Player.

Additional note, in case you make the camera as the child of your player character, be sure to go to the "Parent - Child Relationship" tab, and check "Don't follow parent object"

https://drive.google.com/open?id=1WM-39DrbjTHtJ3P0vPyEXsU-lwrckKvl

It's just the jumping cat demo with my camera attached. This sample make the Cameraman always follow and stay behind the Player, if you want your camera to always focus on the center of the player instead of behind him/her you probably need to delete 2 action boxes that checking the Player's Display Direction. Feel free to adjust things to suit your needs. Thanks for reading and hope this guide help you. Feedback is appreciated!