You wouldn't want to store stuff on the blockchain, it is too bloaty - I have looked in to this sort of stuff before. You could however, use some sort of IPFS for your hosting, if you are trying to get permanent content. But video would be too much on the chain, even text would get bloaty.
Correct me if I am wrong here somebody, but I don't think all the content that is posted here on steemit is saved to the blockchain.
I believe only the underlying steem tokens are tied to the blockchain, right?
I'd think the posts get stored in the chain. On the other hand I've seen there was a few posts deleted. That speaks for not stored then ... the idea to store it "forever" in the chain is used by some coins. Not sure if they do here, but for good content that makes absolutly sense. And in general for this project would do as well.
But I'm seriously n0000000000000b with code ...
Would be nice to get that answerd by someone who knows XD