Hosting the trailer on your site without permission is definitely not allowed, but you are probably allowed to embed a YouTube player with the video. In that situation you'd only need to check YouTube's terms of use, not the original copyright holder (disclaimer: I'm not a lawyer and the legal situation may also depend on the jurisdiction). See also https://support.google.com/youtube/thread/21846505

I've found designers in two ways: * browsing Behance or another portfolio website and contacting designers whose work I liked * finding a freelancer on Upwork As always when hiring people you will need to go through quite a few options before you find a good fit. Take a good look at their portfolios before contacting anyone. On Behance, you may find that many are employed by agencies that might be too expensive (depending on your budget), but you can find independent designers in low-cost countries that are affordable. Upwork tends to the be the budget option where you can also expect lower quality. There, it may be appropriate to hire a couple of designers for a trial project with a low budget and then make final decision based on actually working with them.