It's advised to put images for website in images folder both for good structure and SEO perspective.
And where should I put local video content? A folder called videos?
Yes that could work. It really is up to you though.
Some prefer to make an assets folder and put their assets there and others store it in other servers. I have even known developers who literally upload it in google drive (Dont Do This)
If you are asking as a general recommendation, I suggest putting it in a folder called videos.