Consolizers can and are often used for video capture. This page, as such, lists solely the products which do not double as a consolizer mod.
DIY projects
nisetro_wsc
Created by splash5. Replaces the WonderSwan Color's screen using the ChameleonUSB FX2 FPGA board, allowing the capture of video and audio data via USB.
ExtFriend
The ExtFriend, in addition to being a serial port adapter , can capture headphone audio (but not video) via USB.