Playing a video in both directions - by applying the overlay parameter on the video and using the splice flag. For example, let’s create an instant replay of this bike stunt -

https://res.cloudinary.com/demo/video/upload/bike_stunt.mp4

A first regular view, followed by a “rewind” (carried out by using the reverse effect). Then, another play, this time with slo-mo (accelerate effect with negative values) -

https://res.cloudinary.com/demo/video/upload/l_video:bike_stunt,e_reverse,fl_splice/l_video:bike_stunt,e_accelerate:-50,fl_splice/bike_stunt.mp4