Sorry for the confusion, there was no mention of using the DSLR as an input in your original post!
Currently, Rush doesn't support the use of any external devices on a PC or on the mobile device. The capture mode accesses the built-in camera on mobile devices. You cannot capture video through Rush on a PC. To use footage from a DSLR, you'll have to perform a file transfer into Rush on your PC.
This was directly from the orginal question " capture video from a DSLR on pc". That was also the the post title. It has "DSLR" right there. You must be blind or very arrogant and blasé about doing your job correctly.