You should not have any unmasked static objects appear in the camera view because they may have features that will be tracked and will confuse the algorithm because these features will be stationary with respect to the drone even if the drone is moving.
open vins should support masking parts of the camera(s) to ignore any features in this region. I am not sure how to enable the mask, will double check with colleagues (you could also do a search..).
worst care scenario, the part of the image to be ignored should be blacked out before feeding into open vins - that would be the solution if the mask is not supported. Hopefully that is not needed and mask can be used.
Alex