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I think it technically is possible but the video will have very very high latency (i.e. unusable). It looks like that camera has USB 2.0 which really isn't fast enough for HD video, but you could try simply using the usb_cam package to see things working. Also ROS uses TCP by default which is not good for transmitting large video over wireless, there is UDPROS that uses UDP instead, but I don't know how well it is supported.
I think in reality if you wanted to have a usable video feed, you would need special hardware like a Connex Prosight from Amimon that connects to the camera's HDMI. I don't know much about DJI, there might be something on board the drone that does something similar like letting you send your own video over the Lightbridge link if it has one?
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