I would say nostr.build but push comes to shove, someone could potentially censor it as it is a centralized service

There are some decentralized, blockchain-based video hosting solutions

Once you get a link, you can just distribute it on #Nostr

nostr:nevent1qqsydmtx4d36uwtwleapddv7qjm0d8qhgezewdtky7q609fn2l99eucpz4mhxue69uhkummnw3ezummcw3ezuer9wchsygqe3yp5u44c7crvwf85tgfvap9prpqkyx40wxp2rajkgwqtn3p8dvpsgqqqqqqsf5l99z