Video dimension difference

We've tested the set of 81 videos and found 5 different video dimensions using this notebook

    [[708.0, 478.0],
    [714.0, 480.0],
    [716.0, 480.0],
    [718.0, 480.0],
    [712.0, 478.0],
    [710.0, 478.0]]

Result of applying current blur mask on selected videos:

Image shifts from video to video
Black line appears in some of the videos

Fix

1. Padding the blur window by 3 pixels(left), 12 pixels(right), 2 pixels(bottom)
2. Cropping the image frame to standarize the size to 700 x 470 and get rid of the black lines at the edge.