If you want to crop the source video file to a certain size you should click the “Cut borders” button in the object’s properties window. The following window appears:
Select the portion of the image you want to display and click the “Ok” button; parts lying outside the selected region will be deleted.
By clicking the “Get full size” button you can select the entire image. Also, you can adjust the scale of the image to precisely select the desired region.
This software can be downloaded from Free Video Editor description page.