use https://github.com/dpredie/Midasv2_1_small-TFLite-Inference to generate Depthmap
check https://github.com/dpredie/UE4DepthMapCompositing/blob/main/Exploring%20Depth%20Estimation%20with%20Unreal%20Compositing.pdf for overview
watch https://www.youtube.com/watch?v=-QO_ARniQCA for how to use