This old post has Shotcut add-on files to use defish0r. I will likely include some more filters in version 19.09 (not 19.08 due tomorrow).
I am not certain this will provide what the poster wants. Here is a video about SuperView:
The Shotcut engine filter for that is elastic_scale.
@sauron made a Shotcut add-on filter UI for that in his Google Drive. However, that will not work as intended straight out-of-the-box in Shotcut without an additional (included) filter: Size and Position. You need to add that filter, and change Size mode to Distort to make it fill the frame. I should also mention that you should set your Video Mode so the output aspect ratio is set independent of the video you are filtering. At this point, without changing anything in Elastic Scale, Size and Position Distort will stretch the image linearly to fill the frame. Now, you can go into Elastic Scale and increase Non-Linear scale factor to somewhere around 70%. Very cool! And you do need the complicated and expensive Nuke.