CONFIG_VIDEO_V4L2 (not configurable)

modulename: videodev.ko

and/or

v4l2-common.ko

and/or

v4l2-dv-timings.ko

configname: CONFIG_VIDEO_V4L2

Linux Kernel Configuration
└─>Device Drivers
└─>Multimedia support
└─>VIDEO_V4L2
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
drivers/media/v4l2-core/