Now that you've gotten a video into Video Sequence Editor, you'll discover how to do some soft trims and dissolves to assemble them:
In Video Sequence Editor, move the Current Frame Indicator to frame 148.
Select the Cam2 video strip in Channel 1. Press Shift + D to make a copy. Move the copy to Channel 5.
Note that on the right-hand side of the new strip, there is a solid blue bar at the top, as shown in the following screenshot:
Use the Ctrl + MMB keys to scale the Video Sequence Editor window so that you can see the entire strip and/or the blue bar.
On the right side of the Cam2 strip, there is an arrow button. Click the RMB over the arrow button on the right side of the strip. Hold it down while you start moving the mouse, and then move that end to the right until it is even with the end of the blue bar. The bar will disappear when you reach the end. Press the LMB to release it. Now, the strip is back to its original length.
In the Properties...