Tags as optional, free model convert memory

[xiaojingrich]

Description

Make tags as optional in video summarization, and separate quantize and model inference to free released memory

Fixes # (issue)

Any Newly Introduced Dependencies

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How Has This Been Tested?

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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.