Youtube has a CC closed caption option. is that what you meant?
Yes, everyone know what CC or SDH or SL or S or 888 (old time) etc.. that we know it, but no one input subtitle include for how to or tutorials.
they talk talk .... we deaf people keep eyes on video without dont know what they say...
like on cooking, they put sugar into bowl, oh wait i wonder which one this look like sugar or salt... that problem...
hey, why dont you unplug your pc audio speaking or switch off (muted), then how you feel and understand how to or tutorials.