Shri Gayatri SahasraNam Stotram is in Sanskrit. It is from Devibhagwat 6th Adhyay. God Naranyan is telling these pious thousand names of Goddess Gayatri to Brahmrushi Narad. FalaShruti: Japa, Homa, Dhyana or writting of this stotra blessess such devotee by fulfilling all his desires. Devotee suffering from bad health or diseases get cured. Devotee who wants money, Mukti or anything his desire is fulfilled. God Narayan is telling Brahmarushi Narad that it is true and true and true.
Gayatri SahasraNam Part 1 and 2 are only for Text; in the video it is full.