Video source tweet: https://twitter.com/santvarun/status/1356209645329776640?s=09
The barricades include metal barricades, concrete wall and blocks, barbed wire fencing, metal nails fixed in road to puncture vehicle tyres, etc.
Other media and news:
https://twitter.com/kainisms/status/1356220304448770048?s=19 : Filling barricades with concrete
https://twitter.com/NSUINagaland/status/1356449354312151040?s=19 : Aerial photo of barricades
https://twitter.com/ndtv/status/1356479070557495296?s=19 : News source with photos, metal nails in road
News articles:
Financial Express: Internet suspended near protest sites
Indian Express ~~~~ NDTV: Delhi Police get metal batons
Man, so much is going on and it's not peaceful.