SUAlive looks very promising, although the user interface is not very intuitive: I was not able to get anything done till I watched the demo twice.

So far, I did recreate the demo with the interpolation, although after some fiddling it no longer works -- I get an error "Can not animate. No action to play" when pressing the "Run all" button, even though there is a an action (with green check mark) listed in the bottom half of the SUalive window.

Also, I have not been able to define a camera, let alone a path. In the "Camera" tab, there is a text field, but that can't be selected. There is a button "New from window", which opens a new window with some apparently camera settings, but none of the field (name, positions) can be changed, and none of the buttons can be pressed. Perhaps this is intentional (I only have Sketchup Make, perhaps this only works with SketchUp Pro).

Or perhaps, the camera is not yet implemented, like the rotation, translation, scale and layers tabs. At least all of the buttons and fields in those tabs are disabled, and don't work (yet?).

I'm using SUAlive 2.35.60017 on SketchUp Make 2017 on macOS 10.12.6.