You can check out any of these resources:
- early published today post on Reddit with a list
of resourses to promote your startup and gain clients.
- Reddit ads also working well. Good post
how to boost your revenue not spending a ton of money.
- find some vloggers on YouTube and establish partnership with them.
- write blog related to video production or/and find blogs/website related to video production. Public guest posts in that blogs. For searching such blogs, try BuzzSumo. Create different content (video, infographic, tuturial, ebook)
- try guru.com (another great market place);
- angel.co - a huge startup base, a ton of potentional clients.
- create Landing Page with information and discount. Promote through social networs and other channels.
- referrals. The best and cheapest leads come from referrals (as a bonus create affiliate programm).
Of course it all demands a lot of time to use every channel, so just start from small. Hope it helps.
Feel free to contact me.