There was a slight smear on my 24mm lens for the one establishing shot I got for this scene. It's the lighter area right above the blonde girl - you can see where the green of the flowers and bushes gets lighter.
Chris gave you a good way of doing this. I would use a duplicate layer with a feathered mask but apply a color correction using Curves/Levels or Colorista to try and match the contrast and saturation of the rest of the clip. The trick will be to find the right shape and feather for the mask.