in your cloud recognition sample code there is no provision provided for image not recognize
That's because it works differently.
VisualSearch_UpdateCallback
...is called when the target finder has new results, and if you delve deeper into the TargetFinder API you may find other status values that could be of use.
also it(camera scaning) continously runing till recognition,
That is the way the sample works. If you can fully understand the code then you can create your own sample that can work differently.
I just want if image can't be recognise then it go for text recognition(that thing we will try),
One thing you could try is setting up a Timer and then if there is no match within that period then you can go for TR, but exactly how you do it is entirely up to you.
Is it possible to capture image (instead of running cotineous recording for image recognition) & send it for text & image reco?
No - video only.
N
It should be possible, however it will probably be far easier on Unity, as all you need to do is drag and drop the prefabs, configure them and run.
So if you are unable to progress with native, I highly recommend using Unity because (as I keep saying) it will save you weeks if not months of effort.
Try it if you can.
N