Making a movie available via BitTorrent is fine. But using Tor, either for seeding or recommended for downloading, is unwise. It's hard to properly configure torrent clients to use Tor without leaking, so recommending that people download via Tor would put them at risk. And even if torrent clients are properly configured, they would be stealing bandwidth from people who just need Tor for browsing.
A better plan would be to lease a seedbox from (for example) BolehVPN. To stay anonymous, use Tor for all associated connections. Get the price from the BolehVPN site. Then buy enough Bitcoins, plus 20% to cover mixing fees and price changes.
I've written a guide that covers using Bitcoins anonymously in great detail. I recommend multiple transfers through mixing services, using MultiBit clients in multiple Whonix instances. For better anonymity, each Multibit client should have a wallet with several receiving addresses. For each transfer from one client to another through a mixing service, you randomly spread the Bitcoins among several address combinations. That increases the anonymity that each transfer provides, by reducing correlation based on quantities transferred.
Reputable mixing services include BitLaundry and Bitcoin Fog. Avoid OnionBC. It has either broken, or become a scam. It accepts deposits, but won’t execute withdrawals.
After each mixing step, it’s crucial to check receiving addresses for taint from sending addresses. On the Blockchain explorer page, enter each receiving address in the “Search” field, and hit enter. Then click “Taint Analysis”, and download the results. Once you have all of the data, search the taint results for each receiving address for the corresponding sending address. If it appears, you need to remix that component.
Once you have your anonymized Bitcoins, browse the BolehVPN site via Tor, and lease the seedbox. Then upload the movie to the seedbox via sftp via Tor, in relatively small, random-size pieces.
Now you have a torrent to share. People can download as they wish.