Returning the Centre Coordinates

[ParthikB]

• Added a function that will return the center coordinates of the detected bounding box per frame.
• Can we widely used to get the center coordinates fast. User won't have to add any ninja code him/herself.
• Can be used to track object location (which I did in my recent project, and that's what bought me to this PR)
• Added a 'verbose' flag which would print the value of the Coordinates in the console when set to True.

code in use

console output when verbose=True

(detecting the centre per frame)

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[ParthikB]

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[pkulzc]

Please resolve the conflict.

[ParthikB]

@tombstone @jaeyounkim @pkulzc Hello, could you please take out some time out of your schedule to look into this PR. Thank you.

[ParthikB]

@tombstone @jaeyounkim @pkulzc Is this PR alive?