Is it somehow possible to configure chroot to allow (read only) access to a particular folder outside chroot ?A chroot is basically a special directory on your computer which prevents applications, if run from inside that directory, from accessing files outside the directory. In many ways, a chroot is like installing another operating system inside your existing operating system.
If that is possible I will install some useful but untrusted/unofficial PPAs inside the chroot environment. But if it is impossible to configure chroot to allow access to a folder outside there is no point.
But question is will the NVIDIA proprietery driver run inside chroot ? vdpau possible ?Accessing graphical applications inside the chroot
You can run graphical applications within a chroot, but you need to provide an X server for them to run in first. The easiest way to do this is to set the display of the chroot system to be identical to the root display of your system's main X server.
In other words, in the chroot shell type