No, I mean 3d conv with lstm.
Yes, u can use 3d conv to extract features directly. Conv is able to recognize spatial patterns; for example conv for pictures can recognize edges and curves and etc. LSTM is good at recognizing temporal information. A LSTM can remember information before the current time steps; for example, LSTM is used in machine translation because we can’t words later in the sentence can have a relation with words in the beginning of the sentence.