There are numerous sites that offer freely available films relevant to academic research. Here is a sampling of especially useful resources:
Your public library also has great video streaming services (like Hoopla, Medici.tv, Kanopy, & Alexander Street). Get a library card to access popular movies and tv shows at home, for free. Public libraries do not usually require residency to get a library card and it's possible to have and use library cards from multiple area libraries.
Tip: When you visit their web site, look for Digital Resources, Virtual Resources, or eResources, this is usually where you will find video streaming