Isolated object motiom detection

[poklop]

Hello, thank you for making such a useful project available for the public. I am trying to find in my video footage times when there were object (paper box, water bottle, glass bottle) thrown or fallen from my neighbor's balcony to my garden. I am using regions around the area, but there is still a lot of movement detected (mainly clouds moving) Is there any fine tuning for that please? Thanks