Hey Devs 
I've been exploring some watermark APIs and after Image Watermarking, I've put together a list of some really cool Video Watermarking APIs and their providers. I look into account details like how how customization they provide, the kind of support they offer, input and output formats, and more. (By the way, even though I'm part of one of these providers, I did my best to stay neutral)
Check out the blog post: TOP Video Watermarking APIs - Comparison, Features and Functionality
Now, these recommendations are based on my own research and what I've seen. Are there any plugins that do the same thing? Have you ever tried out any other providers? I'd love to hear about your experiences with them.