After your comment I got interested in it too. This information I found here http://www.semya-rastet.ru/razd/prishla_opeka__chto_delat/

Of course on the territory of your private property you can videotape and record everything you wish.

But according to the law it is forbidden to use hidden camcorders camouflaged for household items and different bugs.
"Since January 1, 2010, the third part of Article 138 of the Criminal Code of the Russian Federation is stated as follows:" Illegal production, sale or acquisition of special technical means (including camcorders camouflaged for household items) intended for receiving information in a secret way- is punished with a fine in the amount of up to two hundred thousand rubles or imprisonment for up to three years ".

It means you can use at home just a usual cam or a dictaphone but not other hidden devices if you don`t want to get to prison, it is forbidden even to buy them.

https://masterok.livejournal.com/3426344.html Here is explained everything in details