This is a video that was posted to YouTube a while ago but doesn’t seem to have seen much traffic. It was posted by the channel Handy Bear (aka, Michel), and unlike most camera slider motorisation conversions these days, there’s not a 3D printer in sight!
The Slider shown in the video is just a cheap one Michel found online. It looks like many inexpensive sliders, and these are often the best candidates for a motor conversion. An Arduino Nano controls the electronics.