Open Safari for me
Block video for the currently displayed website
In the Safari app Smart Search field, then choose Settings for [website].
Hold the pointer to the right of Auto-Play, then click the pop-up menu and choose an option:
Allow All Auto-Play: Lets videos on this website play automatically.
Stop Media with Sound: Blocks autoplay for videos that contain audio, but allows other videos to play.
Never Auto-Play: Blocks autoplay for all videos on this website.
Block video for all websites
In the Safari app select the websites, then click Remove]. Click the When visiting other websites pop-up menu, then choose an option.
See alsoCustomize settings for each website in Safari on MacMute audio in tabs in Safari on Mac