Micro On Screen Display

I have a project that I would like to attempt

it's pretty simple really

I'm using a Link sprite camera a modified video experimenter circuit for the arduino pro mini
and the 4D systems uOLED-96-G1-uSD-Serial for display and obviously an arduino pro mini

now I know the arduino cannot save and process camera speeds to take pictures from what I learned in another post
but I'm not attempting that what I would like to attempt is to stream video to the oled with a custom osd from the arduino
that's it I was wondering is this possible any and all info is apperciated

No it would not be practical. The JPEG data that you read from the camera would need to be decoded and converted to the bitmap format that the 4D display requires. Your programming testicles would need to be pretty large to accomplish that.

This won't work. You have three devices that all speak different video formats:

The camera outputs a data stream of JPEG images. You don't have the horsepower to decode this in real time via the Arduino.

Serial LCDs take pixel data as a source. They can't use a JPEG stream, so you can't just read the camera and send it to the LCD. Even if it did accept JPEG data, you wouldn't be able to overlay without decoding, mixing, and encoding. Waaay too much work for the Arduino. Also, there's not enough bandwidth to stream video (as bitmap data) via serial at any reasonable framerate, so it's only good as a graphics display -- not video.

Regarding the video shield, I seem to remember reading that it can take snapshots of video, but it can't run real-time streams through the Arduino. (Again, too much data.) I think it has an onboard video mixer, so it can overlay graphics, but only as a pass-through device. I.e., it uses composite analog video, not a digital data stream.

What about NTSC output if that can work than I can salvage this project

NTSC output would still require decoding, as well as further encoding, making it even more difficult (if it can be more difficult than impossible) for the Arduino.