Tegra 3 SDKs


I am looking for software resources that are available to access the hardware accelerators of Tegra 3.

Image processing:
According to the Tegra 3 specs, it is capable of performing auto-focus and still image stabilization in hardware. What SDK for Linux 4 Tegra or Android (CodeWorks?) would provide the APIs to do so?

H264 codec:
Do the OSs (Android and Linux 4 Tegra) already have codec modules in their filesystem that access the H264 engine, or do I need to get a license?

Are the OpenCV 4 Tegra libraries, in the case of Tegra 3, optimized to use the GPU, or the ARM’s neon vectors only?

Thank you for any help