minor fix: made centre coordinates integer for cv2.circle()

[soumya997]

PR regarding the issue #5249

Its a minor error, please look into it and let me if you if I need to make any change.
There is deliverable that stuck because of this issue. If this gets merged it would be very helpful.

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[soumya997]

Hi @ppwwyyxx can you please look into this PR. I have signed the CLA https://code.facebook.com/cla