As noted, Triple H's entrance at WrestleMania 32 included a group of people dressed up in black with skull masks, as seen in the video above at the 2:17 mark.
Finn Balor was one of the people in costume for Triple H's entrance. Please note that the video above is just to show the people in masks, it is not meant to show that one of them is Balor. I learned that one of the masked men was Balor from a source.
This would not be the first time that NXT talent have been used for Triple H's ring entrance, as Sasha Banks, Charlotte and Alexa Bliss were involved with his entrance at WrestleMania XXX. CM Punk (in John Cena's entrance at WrestleMania 22) and Diamond Dallas Page (driving Rhythm 'N Blues cadillac at WrestleMania 6) also served as extras for WrestleMania entrances in the past.