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I suspect no such product exists. USB A is a data transfer interface standard for computers (and sometimes for power transfer)... Every devicethat isn't computer that sends and or recieves data or video over USB is going to have as its core design assumption that 'the data/video link has a computer at one end of the USB cable'.
The easiest solution is probably going to be a raspberry pie computer, or a mini PC that automatically boots on powerup and auto runs an app to display the video to its main monitor which will be your 7" unit.
Otherwise your probably designing your composite video to USB adapter from scratch and doing much research and programming.
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