message: videoio: drop unnecessary offset for accessing video output buffer
  Fix:
  NDK API AMediaCodec_getOutputBuffer() returns MediaCodecBuffer::data()
  which is actually ABuffer::data(). The returned buffer address is already
  adjusted by offset.
  More info:
  ABuffer::base() returns base address without offset
  ABuffer::data() returns base + offset
diff: @@ -92,7 +92,7 @@ public:
  AMediaFormat_getInt32(mediaFormat.get(), AMEDIAFORMAT_KEY_HEIGHT, &frameHeight);
  AMediaFormat_getInt32(mediaFormat.get(), AMEDIAFORMAT_KEY_COLOR_FORMAT, &colorFormat);
  uint8_t* codecBuffer = AMediaCodec_getOutputBuffer(mediaCodec.get(), bufferIndex, &bufferSize);
  - buffer = std::vector<uint8_t>(codecBuffer + info.offset, codecBuffer + bufferSize);
  + buffer = std::vector<uint8_t>(codecBuffer, codecBuffer + bufferSize);
  LOGV("colorFormat: %d", colorFormat);
  LOGV("buffer size: %zu", bufferSize);
  LOGV("width (frame): %d", frameWidth);
  