When I've seen Gammas talk in videos, their atmosphere is generally serious and focused on the topic at hand. That's what you strike me as. Based off your answers, reactions, and focus on the video, I will say ESI. Your reactions are subtle while maintaining seriousness throughout the video. Not to mention, you seem reserved communicating your answers. Another thing is you sat up straight throughout the whole video and corrected your posture in a couple of moments you were leaning or tilting your head, which demonstrates a rational type in terms of VI. There are my two cents. xD
Side note: You seem like a real nice dude.