I can implement this feature, please provide more details regarding the watermark position on your videos, formats you wish to be available on browser and how much screenshots you need for each video.
I have been a software developer for more than 6 years. I previously work as a web developer for a private company making administrative websites and tools for web developers. I am experienced with PHP, MySQL, Wordpress, Javascript, Laravel, Codeigniter and more.
Please feel free to send me a message so we can discuss further details. Thanks