Testing Samurai was fun, but I had to modify the demo script. First I disabled all txt paths, and I used hard-coded BBox, which is a little confusing for Nuke users because Samurai calculates BBox differently. And on the end for the export I just turn off the video and rectangle and have only a mask for use in Nuke. Shuffle the blue channel to Alpha and we have Samurai masking 🙂