Let user be able to disable browserstack video recording

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[ishitatsuyuki]

@JakeChampion Please sign the CLA.

@dignifiedquire Please take a look!

[JakeChampion]

I signed it!

[googlebot]

CLAs look good, thanks!

[ishitatsuyuki]

@dignifiedquire friendly ping, please review!

[dignifiedquire]

Thank you

[oliviertassinari]

I'm curious, what's the point of disabling the video? Can we expect perf improvement?