Of course there is Open Access video content available on the web.
Some interesting sources:
YouTube* is owned by Google, and is a frequent first stop for free streaming video content.
Vimeo is a site where account holders may share their own uploaded digital video content for a fee, but those videos may then be free to watch.
Open Culture Cultural and Educational Video states that they have "4,000+ Free Movies Online: Great Classics, Indies, Noir, Westerns, Documentaries & More". This site is better browsed than searched.
Public Domain Review has films in the public domain dating between the late 19th century. Content is weighted toward the early period (late 19th century to ca. 1925), with some from the 30s, 40s, 50s, 60s.
*When engaging with recommendations fed by YouTube itself it is worthwhile to proceed with caution and a critical eye. Like other social media, YouTube is interested in keeping eyes on their site. The YouTube algorithm achieves this by evoking human outrage through the content it serves unsolicited by the user.