While there is not a feature to add in a disclaimer slide to videos in the current product, if this is something you are interested in there are a few options available to you.
1. If you would like to see this as an option in a future release of the Jive Platform, I would suggest creating an idea in the Ideas for Jive space, where our Product Managers review top rated ideas for possible inclusion when considering features for future versions.
2. If you are interested in this being a feature in your current instance our Professional Services team can work with you to determine the scope of the project and assist in developing a custom solution which meets your needs. If you are interested in this option, please submit a case in your Jive Community customer group where the next available support engineer can assist in setting up an engagement.