You can use a service like nostr:npub1nxy4qpqnld6kmpphjykvx2lqwvxmuxluddwjamm4nc29ds3elyzsm5avr7 or upload videos directly on basically any client (I personally use nostr:npub18m76awca3y37hkvuneavuw6pjj4525fw90necxmadrvjg0sdy6qsngq955 and nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg )

If you want to post long-form videos, here is my workflow:

nostr:note1xfps9jg77jhc4mgcql62yvtvhmjwk9eahxus5yl844edawpzxxfqap86km