background with dotted effect

Hy,

how is possible to have a background with dotted effect for Images or Video, as in the Header video of the Upholsterer templete Homepage?

http://themes.muffingroup.com/be/upholsterer/
 
or in this other website, http://www.naxaf.com/    where the dotted  background effect is visible also from Mobile?

Thanks.


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