The word God is borrowed from the west. In the West the word God means Jehovah or a similar person or being. In India it does not mean that. 'God' is a very loose term that is used to mean anything from a personal deity to a celestial being to the Universal Spirit or Universal consciousness. There are many different words in Hinduism such as Brahman, Paramatman, prabhu, Ishwar, Bhagvan, deva etc. to refer to God, which refer to its different attributes.
In the second video he talks of the different deities that we worship or imagine. These are human creations based on cultural compulsions. This is well accepted in Hinduism. Devotion is a natural emotional impulse that we have and we need deities that we can identify with. People worship different deities in the form of a father, mother, protector, friend, child and even lover as per their needs. This is the devotional path (bhakti marga). This is one of the means to spiritual development.
The real 'God' or rather the highest level of God, if you can call it that, is believed to be the universal consciousness that pervades all creation. This is the highest level of consciousness within us. This is not easily understood by normal people and requires a certain level of spiritual development. Once a person reaches a certain level of spiritual development, he or she can follow the path of introspection and inner reflection. This is called the path of Wisdom (Gyana marga).
Once a person follows this path the person realizes that not only the body but the mind with all its instincts, emotions, intellect and ego are just objects and different from the subject (first video). This is when the person merges or dissolves into the supreme consciousness (second video)....like a river flowing into the ocean.
This Universal Consciousness obviously cannot be understood intellectually. It is he ultimate subject and is beyond our human capabilities.
This is what both the above videos are talking about.