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No.  sRGB isn't used in video.  ITU-R BT.601, ITU-R BT.709 and ITU-R BT.2020 define video.

But what about RGB-video ?
Uncompressed RGB Video Subtypes

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The luma channel in Y′CbCr video (the Y value) can range from 0 to 255, but full black is defined as 16, and full white is defined as 235.
The values from 0 to 16, and 235 to 255, are reserved. CbCr can range from 16 to 240

But what about YUV (analog video:  NTSC, PAL/SECAM, video on VHS tapes ) ?
How defined reference black and how defined reference white in YUV-analog video (not Y′CbC) ?

About full range Rec709 (0-255) and  legal range (video levels) Rec709 (16-235) ..

Quote from internet:
As far as I'm aware there is no such thing as "full range Rec709 (0-255)".  It's certainly not in the published spec as posted on the ITU website.  When expressed in 8-bit terms Rec.709 or BT.709 defines values of 0 and 255 as reserved for synchronisation purposes and values from 1 to 15 and 236 to 254 as headroom to handle transient over- and undershoot.  That's it.  There's no ambiguity in the specification.

Has HDTV  full range Rec709 (0-255) or  legal range (video levels) Rec709 (16-235) ?

The range of sRGB is 0-255.

But why is it contrary to the standard  BT.709 ?  The standard says that the range is 16 35.

 https://en.wikipedia.org/wiki/Rec._709
Rec. 709 coding uses SMPTE reference levels (a.k.a. "studio-swing", legal-range, narrow-range) levels where reference black is defined as 8-bit interface code 16 and reference white is defined as 8-bit interface code 235.

https://en.wikipedia.org/wiki/SRGB
sRGB uses the ITU-R BT.709 primaries, the same as are used in studio monitors and HDTV

However, I was looking for information about sRGB and found this:

http://www.imagemagick.org/script/color.php
The format of an sRGB value in the functional notation is 'rgb(r,g,b)', where r, g, and b are either three integer or float values in the range 0—255 or three integer or float percentage values in the range 0—100%.
and this
..sRGB values having a range of 0-255..

I'm a little confused. I can not understand this contradiction. What is the range of sRGB ?
Explain please.