Get a reddit video link from gif or video that hosted from reddit. Only work for new design of reddit (beta reddit). To do that go into reddit hosted video link EX: https://www.reddit.com/r/gifs/comments/8gnf5p/well_i_will_never_look_at_tech_decks_the_same_way/ then wait for a sec and then click the '🔗' icon at top of upvote post button.
Update please!
Script needs an update