After I finished the video and sent it to the client, he did not pay me and blocked me. I think since I am dealing within upwork, then support can help me, right?
Clients can not simply unilaterally decide to not pay freelancers.
If you worked and did not get paid, then it is because YOU used Upwork incorrectly.
No, Customer Support can not help you. Don't contact them. We will help you understand the mistake you made.
Do you have an official contact? Do you see this job listed here:
My Jobs -> My Jobs