If you are a Mod of a subreddit, you can add our video downloader rule to AutoModerator. This will enable AutoMod to reply with a link to download the video found on a post.
How to add the rule
Locate AutoMod's configuration page located at https://reddit.com/r/YOUR_SUBREDDIT_NAME/wiki/config/automoderator.
Edit the wiki page that defines its configuration for your subreddit and insert the below rule. That's all.
To learn more about AutoModerator, please see the official reddit guide.
Note: In order to set up AutoModerator, you will need to have both the "wiki" and "config" moderator permissions in the subreddit.