How it tracks blue objects?

Take each frame of the video and convert from RGB color scale to HSV, then threshold the HSV image for a range of blue color, taking a lower bound and an upper bound respectively. Finally extract the blue object alone.

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/2201921b-bcd8-4ba3-91ee-fbc18385bff3/Screen_Shot_2020-08-21_at_11.39.27_AM.png

Demo

Detected blue stole and blue cash

Detected blue stole and blue cash

Detected my blue case lip balm

Detected my blue case lip balm