Improve YouTube QA app for better usability and performance

[yulaicui]

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• I have searched the EVA DB issues and found no similar feature requests.

Description

Improve YouTube QA example app for better user experience and capacity. It currently supports QA on videos and only rely on transcripts. It can be improved such that the app can gain more contexts of the video via OCR and have more intelligent ways to combine answers from chunks.

• Enable ChatGPT test with real api key.
• Get visual contexts from OCR.
• Support video chunking with API instead of external functions.
• Support processing videos from local directory.
• Generate summarization blog posts.

Use case

• As a user, I want to generate a blog post of a video I want.
• As a user, I want to ask questions about a video I have on my machine.
• As a user, I want to ask questions about a youtube video whose majority of contents are in the graphics of the video.

Additional

No response

Are you willing to submit a PR?

• Yes I'd like to help by submitting a PR!

[xzdandy]

@gaurav274 Is this issue still in the picture? Shall we close?