What will be the input_shape of tf.keras.layers.Conv3D be for these inputs
From Keras document,

Input shape
5+D tensor with shape: batch_shape + (channels, conv_dim1, conv_dim2, conv_dim3) if data_format='channels_first' or 5+D tensor with shape: batch_shape + (conv_dim1, conv_dim2, conv_dim3, channels) if data_format='channels_last'

Assuming data_format='channels_last' and num_of_videos may be used to decide batch_size(which is not required while defing input_shape),
input_shape=[ 100, 100, 37, 3 ]