To run either of the jupyter notebook on local machine the installation instructions need to be followed.
The Object detection in Images and Image Segmentation can be run on google colab fromt the following links The object detection on live video file can only be run on local machine as google colab cannot read from webcam.
In case of Object-detection in live video doesn't work try changing the value in cap.Capture() inside the bracket
The github notebooks and the google colab files are different, for local machines always download github notebooks