A little further to what David said:
All stabilizers work the same way. They analyze the motion in the video and then move the shot in the opposite direction to compensate.
IOW, if your camera jerked to the right, the stabilizer will move your footage to the left, revealing black on the right side of your screen.
At the end of the process, we simply scale the footage up enough to hide the black.
There is no way around this. Those black areas are places where no information was recorded onto your tape.
Arnie
Post production is not an afterthought!
https://www.arniepix.com/