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Not radical enough!
You not need to see a seagull, it is better to hear a seagull. Especially for the reason your vision angle is not all around and behind the tree.
Your hearing is.
And when you hear a seagull, your phone hears it too, and there is no need for "a popup insert record into the database Android/Apple gesture widget" shit. It can be done automatically every time!
You don't want me to continue, do you?
I think this is the wrong way to look at this problem. You can easily build an app for detecting seagull by their sound but that app isn't easily customizable and you can't throw it easily against different problems.
There's a reason why most of us still use paper from time to time. Multiple local rationalists I know use paper notebooks. That's because paper is very flexible. For all it's problem it still outperforms digital tool in many circumstances because it's so adaptable.