crm for network dvr

Need an Expert Or who already done similar kind app we have a network dvr which we want to access in our application that will show images of camera those are connected with dvr & the application should have a capture button which will capture the images from camera those are connected via dvr let me now if you have any question before biding Please be sure you have already done this ? or send me complete logic with flow how's u will do it ? if you have answers then happy biding .. Thanks