The LogiCORE, Video Mixer will be a license free IP and bundled with Vivado in 2018.3.
The Xilinx® LogiCORE™ IP Video Mixer enables users to mix video layers. The LogiCORE is successor to LogiCORE On-screen Display currently in maintenance mode. Each layer can be up to 4K resolution and allows mixing of up to 8 streaming or memory layers. An additional layer for logo insertion is allowed from block ram.