When you read the "Video Capture Interface" section of the Aspeed AST2500 Datasheet, it claims support for "Analog VGA" and "Digital 24-bit RGB."
Features integrated Gigabit Ethernet , USB, SD/MMC, SPI, and I2C controllers for robust input/output handling.
Search for the term "Graphic Engine" in the datasheet. It supports 2D hardware acceleration. While the AST2500 can't game, it accelerates JPEG compression for remote video. This is why iKVM on an AST2500 feels snappier than software-rendered BMCs.