You can control some of the features of your video via URL parameters. 

This is useful if, for example, you'd like to have the same video autoplaying on one page and not autoplaying on another one, without having to use two different embed codes.

Here are the features you can change: 

noautoplay=true (disable desktop autoplay)
nopause=true (disable pausing)
seek=false (disable seeking bar)
nomobileautoplay=true (disable mobile autoplay)
mobileunmuteoverlay=false (disable mobile unmute overlay)

And here's an example of them being combined: 

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