Here are some very short clips that help explain it.
The first is a basic overview from Khan academy and runs about four minutes.
The second clip explains the three types of kami, or gods. These include ancestors, spirits, and souls of great people, all of whom coexist with us in the natural world.
The third clip explains the importance of the torii gate and the Shinto shrine. And finally, a professor explains the great myth of the Japanese sun god, Amaterasu who is the daughter of Izanami and Izanagi who made their daughter ruler of the sky.