Video - Cropping

Hi Malvika,

Onscreen Visual: (see attached jpeg)
Click on video in timeline
Click Edit video on toolbar, editor window appears.
Click Crop video.  Edit box to crop dimensions required.
Save

Duration:  To edit length of video click Trim.

Here'sa link for overall look at what can be done:
https://community.articulate.com/articles/storyline-360-editing-videos