I uploaded a video for my website and landing page design gig. I added nothing violataing content, why fiverr rejected it after reviwing it.
Perhaps you used images or video content that was not your own. Fiverr has ways of identifying stolen content. If someone else uses the same imagery of video elements, then it might be rejected as unoriginal.
In second revision of submission, the same video approved now by Fiverr team.