For permanent links you can use: https://ezgif.com/reverse-video?url=https://example.com/video.mp4
Free online video reverser tool
Upload a video file (up to 100 MB size) or paste video file url. Then click the Reverse! button and this tool will output reversed video with the same resolution and encoding (in rare cases with some odd encoding we may default to mp4, you man also choose it manually).
If the video has sound, you can choose to keep, reverse or mute it.