This video is titled "Ikebukuro・Halloween Cosplay Parade in Ikebukuro! Sexy ONE PIECE Team and Cool Metal Gear! Ikebukuro Cosplay Vol. 1" (池袋でハロウィン・コスプレパレード！SexyなONE PIECEチームやカッコいいメタルギアも♪池袋街コスレポVol.1). It was released by "ikebukurotv."

The Ikebukuro Halloween Cosplay Festival introduced in the video, is a Halloween event held every year around Halloween, in which many cosplayers participate.
The event is sponsored by Dwango, Toshima Ward, and Sunshine, which runs the video service niconico.

You can enjoy delicious food in cosplay on the streets and there are also stage events.
This video shows the cosplay parade that takes place on Sunshine Street!
Cosplayers are also asked what it is they enjoy about cosplay in interviews in the video!