You only need to have a look at the documentation:

Yeah, the output of an LSTM is output, (h_n, c_n)

The shape of output is (seq_len, batch, num_directions * hidden_size), where batch is the batch size, i.e., the number of sequences in your batch
The shape of h_n is (num_layers * num_directions, batch, hidden_size); again, batch being the batch size.

So if you want the all hidden states of the 2nd sequence, you could do output[:,1,:] or first reshape ouput = ouput.view(0,1) and then output[1].
Please note that you need to be bit more careful in case you define your LSTM with bidirectional=True; see a previous post of mine 6 (the image in the post my also help with the understanding of the output of an LSTM, although it ignores the batch dimension).