Loitering detection: add cpu gpu and npu docs

Mirror Botrequested to merge
ashish/m9-ld-updates into magic9-manufacturing-metro-vision-apps

Description

Loitering detection: add cpu gpu and npu docs

How Has This Been Tested?

Functional manual testing

Checklist:

  • I agree to use the APACHE-2.0 license for my code changes.
  • I have not introduced any 3rd party components incompatible with APACHE-2.0.
  • I have not included any company confidential information, trade secret, password or security token.
  • I have performed a self-review of my code.

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