Your phone doesn't have a portrait mode .......!!!!
If no, then please continue watching this video.
It will really help you.
I have been using this application for more than 6 months.
It's my personal experience.
You can create bokeh effect, blur background and Depth of filed.
Best app for background blur.
app link: https://play.google.com/store/apps/de...
The photo you have been seeing is the very well known YouTuber Praval Sharma from Sharmaji Technical
My lens canon: https://amzn.to/2Pr30s0
My camera Canon 200d link: https://amzn.to/2OVMXlI
My Microphone link: https://amzn.to/2CL1mtz
My Tripod (RS 1299): https://amzn.to/2JnkUpc