Do you have a device driver from the card vendor that says it works with Premiere Elements?
No, I want to build up a new System and want to know if it is possible to use Premiere elements for editing and playing out HDSDI in 720p.
If not, I have to use another Software for editing.
Using a specialty card requires a device driver from the card vendor (N1) so I suggest you ask Blackmagic if they have a driver that works with Premiere Elements
(N1) - I used to use a Pinnacle DV500 card, which came with a device driver that allowed Premiere 6 (OLD Premiere 6, not Premiere Pro CS6) to activate the card... Pinnacle never wrote a driver for Premiere Pro, so the card would not work when I changed software... you need to check with Blackmagic