default or selected kernelversion does not have config value CONFIG_VIDEO_BUF.
Result is shown for kernelversion 5.15.113

CONFIG_VIDEO_BUF (not configurable)

modulename: video-buf.ko

configname: CONFIG_VIDEO_BUF

Linux Kernel Configuration
└─>Device Drivers
└─>Multimedia devices
└─>VIDEO_BUF
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
drivers/media/video/video-buf.c