Having a video, it will be possibly to say about your close friend's types which you think in alpha and gamma.
You may try IR effects with my examples:
SEI:
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3
SEE:
1 ,
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How to evaluate people examples of types for IR.
For every of human should be seen >= 2 clips for several minutes each, a place with good seen face. You concentrate on impressions from nonverbal of that human, not from what he talks or what does.
After you've seen all people examples of some type then you create "general image" for this type.
Then you evaluate and compare these "general images" of types only.
For better IR you evaluate which type is felt as more comfortable/pleasant, appropriate for friendship, and lesser who irritates, tires, felt as alien.
Also [not for this comparision], more differing by 4 strong functions types are felt as more intriguing and lesser boring.