What is the name of a camera that can be discreetly filmed without attracting the attention of others and that it has a decent picture quality?

Question

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I've seen bloggers filming in public places, so it's not noticeable, and the picture is good. How is it done and what kind of camera? The same GoPro can be seen in the hands

Answer 1

There are cameras, but Sha644 correctly noted that there are no legal ways to obtain them in the Russian Federation.
And so you can also disguise GoPro that if you don’t look closely, you won’t understand.
In any case, the quality of the picture directly depends on the size of the lens and matrix, and the size of the camera already depends on them.