A frame from security video recorded Monday at the Dunphys' home shows a man entering through a door, after he broke its glass. (CBC)

Police are looking for a man who broke into a home in a community south of St. John's this week, in an incident recorded by the victim's own security cameras.

"The glass was all over the floor," Witless Bay homeowner Deanne Dunphy told CBC News, pointing to where a glass door by her home's backyard patio had been smashed open on Monday.

The Dunphys were able to give the RCMP quite the head start: video shot by security cameras installed in both the front and back of the newly constructed home.

The videos show a man ringing the doorbell of the front door. When no one answers, the man moves to the back of the house and set to work on the back door.

After prying at the corner of the glass patio door, the man checks a few times over his shoulder — although he seems unaware of small, top-mounted cameras that recorded his movements.

When the door's glass falls out and shatters, the man steps through the frame of the door.

Stolen jewelry included sentimental pieces: victim

Four minutes later, the man is seen leaving the house, zipping up a bulging jacket.

Deanne Dunphy points to where she found shattered glass on her floor on Monday. (CBC)

The Dunphys reported the theft of a considerable amount of jewelry to the RCMP.

"He took all of my jewelry, he took stuff that was sentimental," she said.

"He took my wedding rings, a new diamond ring I got on a cruise, he took my family ring. All I have left is what I happened to have on me at work that day."

Having built a new home in Witless Bay, the Dunphys installed security cameras rather than a burglar alarm, which they thought would be of little use.

"Our closest police station is [a] half-hour away or more," she said.

"So if my alarm did go off, they would call me at work, which is in St. John's … so obviously whoever's been here could have me gutted by the time I got here."

Speaking with CBC News on Thursday, Dunphy said she is still shaken by what she saw Monday when she came home.

"There was actually blood on my bed," she said. "You can still see the stain here where I tried to wipe it out, so obviously he had cut himself."

RCMP said they do not have a suspect yet, but are asking for the public to contact investigators if they have information arising from the video.