Technically most minting platforms like Manifold, MagicEden, etc support uploads of MP4s.
The two primary methods of uploading and consuming videos at this moment are Dracula and Zora.
Drakula.app: earn using social media.
You've been invited to create on Zora by gramajo.eth
Just like Twitch has created a whole new genre of content creators. Being an onchain livestream unlocks a ton of benefits from live snapshot of holders, bonding curves and more.
One of the more well known livesteaming platforms is unlonely. They were of the first, if not the 1st onchain livestreaming platforms.
A new competitor has joined this space recently as well called Streamm.