ASMR videos tend to soft spoken or whispered. Sometimes they'll include other sound that are considered calming like tapping. There's a Vox article called "ASMR explained" you might want to read for more info.
I really don't get the whole ASMR thing. It seems like every video is labled ASMR and I don't really understand what really makes a video fall in that category. It's not like there is a ASMR police that say you can't all something ASMR but it might be helpful for those of us who don't get it.