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I had it done at Earmark Car Audio at Lewisville and then I had some issues...but they fixed it right away. The price was very reasonable. It is cheaper if you buy the dash cam and they will do the wiring.
I ended up getting Blackvue DR 650 GW dual cam from the installer (I wish I had bought it and took it to the installer would have saved some bucks). I like the video quality but Blackvue has issues with time stamp.
I don't mind the issues with Blackvue and I am happy with mine.
On a side note: I noticed that Rick Bollar has better dash cam and I think you should go for it.