Is there anything like discriminating intellect in Buddhism? I was watching this Youtube video about 'witnessing self':

3 Stages in Witnessing Meditation - On the Journey towards Spiritual Enlightenment
This video describes the three stages in witnessing meditation. It is a technique known as Shakshi Bhav in Vedanta.

In it he talks about developing intellect that discriminates between 'subject and object'. He says discrimination between the 'contents of consciousness' and 'consciousness or awareness' has to be cultivated for spiritual growth.
I haven't come across any Buddhist term which relates to this. Is this Vipassana? If not whats this in Buddhist terms?
In the Theravada traditions, I understand this be a reference to the enlightenment factor of investigation (dhammavicaya-bhojjanga).
In the field of dhamma, discrimination comes about by the very act of investigation, and what is discriminated is then known as arising in dependence on other factors and that, globally, those factors harbour three definitive characteristics: transience, unsatisfaction and not-self. This is understood through what he calls the contents of consciousness but what I would call the six-sense consciousnesses - sometimes enumerated as 8 or 9 consciousnesses to include mānas-vijñāna and mano-vijñāna. I think the ninth consciousness is seen as nirvana.
With regard to the consciousness or awareness aspect (possibly nirvana) I suggest reading the fascinating answers to this very interesting question: What is the invisible consciousness or consciousness without surface?.
It is only by investigating (and discriminating) the six-senses in this way that they are broken down by wisdom-understanding leaving behind a deeper understanding of reality; what you might call consciousness or awareness. I cannot see this as a cultivation. Nothing is cultivated. It is just that complications and their disturbances were removed to reveal the simplicity that had always been present.