I like apropos as well. Here, for instance, is the list produced by "apropos video".
Code:
$ apropos video
amdgpu (4) - AMD RADEON GPU video driver
ati (4) - ATI video driver
dvdunauthor (1) - Decodes DVD-Video file structure
dvgrab (1) - Capture DV or MPEG-2 Transport Stream (HDV) video and audio data from FireWire
fbdev (4) - video driver for framebuffer device
ffmpeg (1) - ffmpeg video converter
ffmpeg-all (1) - ffmpeg video converter
ffmpeg-scaler (1) - FFmpeg video scaling and pixel format converter
kdenlive (1) - An open source non-linear video editor.
melt (1) - author, play, and encode multitrack audio/video compositions
modesetting (4) - video driver for framebuffer device
mpeg2desc (1) - multiplex audio/video streams
nouveau (4) - NVIDIA video driver
radeon (4) - ATI/AMD RADEON video driver
vesa (4) - Generic VESA video driver
video_format (7) - Proposal For A Video Format Preference Specification
vmware (4) - VMware SVGA video driver
xvidtune (1) - video mode tuner for Xorg
xvinfo (1) - Print out X-Video extension adaptor information
youtube-dl (1) - download videos from youtube.com or other video platforms
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