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Summary: provider callback uses video sampler to copy/scale input frames using sws_scale function, added option to use av_image_copy to copy image planes in case if sws_getContext fails (required to support AV_PIX_FMT_PAL8 pixel format)

Reviewed By: ovoietsa

Differential Revision: D36466749

fbshipit-source-id: 1674f98a362db835d147800c24bdda6f82d2f8ff
Co-authored-by: Sergiy Bilobrov <sergiy@fb.com>