It is not necessary to create learning videos from scratch every time. Many Open Educational Resources offer up freely available video content on a variety of subjects that you can curate or treat like a virtual field trip where you send your students out to view a video from another resource and report back. Before we jump into curating video content, let's take a moment to examine how copyright and the public domain.
The Salt Institute for Documentary Studies began in Maine almost 50 years ago to explore the unique stories of Maine and Mainers. The Archive, maintained now by Maine College of Art, offers a variety of documentaries in print, audio, and video for your learners to explore.