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These are a couple of opencv functions regarding ellipses:
// this outputs to 'pts' the points representing an ellipse arc defined by the other parameters
Core.ellipse2Poly(center, axes, angle, arcStart, arcEnd, delta, pts);
// this draws an ellipse
Core.ellipse(img, center, axes, angle, startAngle, endAngle, color);
axes parameter is of type Size and means the width and height of the axes.
I will improve the answer if you provide more details.