It's not very much. 100 GFLOPs is about 1-2 Haswell/Broadwell cores (32 FLOP/s * ~2 GHz AVX frequency). Even 2015 era mobile GPUs like the Apple A9 GPU (iPhone 6S) is higher throughput (~150-200GFLOP/s achievable).

If you're executing these models at 30FPS on an HD stream (say ~1mm pixels/frame), you have roughly a 100 * 10^9 / (30 * 10^6 ) = 3,000 flops/pixel budget if you're operating at peak, which is about the same flops/pixel of a 16 channel -> 16 channel 3x3 conv. In practice of course you can usually operate on a much smaller spatial input.