This incident took place in Karachi, Pakistan in August 2019 before the coronavirus pandemic.
This video was uploaded by Pakistan Today Webtv on 23 August 2019 stating that the incident took place at a mosque in Gulshan-e-Hadid in Karachi, Pakistan. The man was mentally unstable.
An article by Urdu Point also reports that a mentally ill man who entered naked inside the Gulshan-e-Hadid Mosque was arrested and was said to be a police commando.
Therefore, an old video is being shared on social media with a misleading caption, this video is nowhere related to current coronavirus situation in India nor he is a Tablighi Jamaat member kept in isolation.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.