vcio interface permits input and output access to a Raspberry Pi’s VideoCore multimedia processor, typically used to improve graphics performance and to accelerate the encoding or decoding of media codecs.
This interface is primarily intended to be used with Ubuntu Core.
A Raspberry Pi permits its GPU to be programmed from userspace via the
device, access to which this interface enables.
The Kodi-Raspberry Pi standalone snap uses the vcio interface, as configured in its snapcraft.yaml: https://github.com/ogra1/kodi-pi-standalone/blob/master/snap/snapcraft.yaml
The test code can be found in the snapd repository: https://github.com/snapcore/snapd/blob/master/interfaces/builtin/vcio_test.go
The source code for the interface is in the snapd repository: https://github.com/snapcore/snapd/blob/master/interfaces/builtin/vcio.go