The Patterson–Gimlin film, shot in the late 1960s, purports to show a female Bigfoot taking a stroll through the woods near Orleans, California.
The video is very shaky:
A reddit user stabilized the video so you can see the Bigfoot much more clearly. As Relatively Interesting says, "Spoiler alert: it really looks like a man in an ape suit."
Here's the stabilized version: