Updated version of @Leanders answer for 2.8
Re a question re updating @Leander's script TypeError: expected 'Depsgraph' type found 'Scene' instead thought I would have a tilt at giving it a 2.8 slant.
The theory is much the same, re creating the object then moving verts with a handler.
Creating the object
Put the object in a collection ...
You can do this by running your image through an Emission shader and then mixing That with a Transparent shader, using the image alpha as a mix factor. Then, make sure to enable "bloom" to make it glow.
There are dots beside most of the fields in effects, just like in modifiers. Clicking on the dot will insert a keyframe for that property.
Also hovering over the field and pressing I also inserts a keyframe for the value. This works in shaders too.