In h264 update the sps and pps parser to save sei data

[mohammedzakikochargi]

Describe the bug
The h264 bitstream to save sps and pps data, currently parses only if the bitstream if buffer starts with sps information. But for some h264 bitstreams sei information prepended before sps data hence the parser fails to save the sps and pps data.

To Reproduce
Create a pipeline connecting rtspCam module to mp4Writer.

Expected behavior
The parses should also look if sei data is prepended before sps . If yes, then it should also save the sei information along with sps and pps data.

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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. chrome, safari]
• Cuda Version [e.g. 22]
• Architecture [e.g. x86_64, arm64]

Additional context
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