In order to crop unwanted borders in video or image, click "Crop borders" in object properties or in object menu.
In the occurred window mark the region which shall remain after cropping borders in video:
After you marked region and clicked "Ok" borders will be cropped. You can achieve the same result if you manually set size of borders to be removed in object properties:
After borders are cropped the remaining part will by automatically inserted in the set object size, i.e. size of object will not be changed.
You can get more information about the program on Free Video Editor' description page.