Default [Q] Block video streaming sites


I have a china made non-brand tablet which is running on Android 2.3.

I wanna block YouTube & some other video streaming sites. I searched for an app in Play, but couldn't find one.

I can't block in router, because I wanna access those sites in my PC & laptop.

Is there any way to do, as we do in windows by adding those URLs we wanna block to hosts file?