• Goto Share Menu and select Take Video
  

• You will be brought to the Table Top if not already there
  
• Using the section cut frame, horizontally cut your model to reveal enough of the 'floor plan' to create the track for your video.
  

• Video creation widget will appear on screen
  
• Click on '+Add Key'. This will activate a key which you can place anywhere in the area by clicking on a surface.
  
• Click on a surface to place the key. Since this is the first key that is being placed, it will be the starting point of video walkthrough. The key number is displayed in a banner on the top of the node.
  

•  You can change the height/position of the key by selecting the banner and dragging it to the required height/angle.
  
• To add next key click on '+Add Key' again and click on another point in the area to place the second key. The two keys are connected with a line which represents the path that will be followed in the walkthrough. 
  
• The path connecting the two keys will also display a banner in the center of it containing the info about the camera speed and duration of the walkthrough.
  

• The camera speed can be increased/decreased by clicking on the speed banner and dragging up to increase the speed (and reduce the duration) or dragging down to decrease the speed(and increasing the duration) of the walkthrough.
  
• You can adjust the curvature of the curve by selecting and dragging the line between the two keys
  

• When you are done placing the keys, click Render Track
  

• The button will change to Rendering...
  
• Once the rendering is complete, the button will change back to 'Render Track'
  
• The processing time depends on the number of keys placed, camera speed etc.
  

Video Tutorial