Unable to save video/screenshot

I have a project where I would love to generate quick visualizations of ~100 tomographic scans for a collaborator.
Loading and displaying the scans works perfectly with `itkwidgets` as you can see in the first screenshot.


I figured this should easily work with [this example](https://github.com/InsightSoftwareConsortium/itkwidgets/blob/master/examples/RecordAVideo.ipynb).
On first try I got an error that "the stream is malformed" which led me to submit an issue here.
Now, if I try again (with a restarted kernel), I simply get *no* output and *no* error) with the cells shown below wich are based on the example above.


I would be very happy to get pointers on how I can (automatically) save quick 3D previews of my scans...