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Shadow removal issue usually can be divided on two subtasks:

1. Shadow localization.
2. Adjusting colors in shadowed regions.

Although there are a lot of papers on this topic, you can make a solution prototype with a few OpenCV functions:

1. Try to localize shadow area with threshold.
2. Solve a system of linear equations with cv::solve() to restore pixel's color in shadowed regions, like color_of_pixel_outside_shadow = x * color_of_pixel_inside_shadow, so 'x' will be a coefficient to restore original color. Also you can try to use cv::inpaint() for shadowed regions.