I think it is stills (huge oversampling) meshed together with some form of stabilisation software.. Id love to know which one
rembmers with a 5k still image the images do not need to match properly because there is so much extra cropping space to deliver at 1080
Of course the distance traveled between shots needs to be consistent.. unless the software can handle that, which potentially it could using timestamp meta data!
It might even be possible in photoshop using immense pain to align the frames,
Something tells me that the person who did this has an obsession with cracks in the pavement and maybe a monopod
step click, step click